Hair colouring at salons

Totally depends on the salon, and the colour required/products used, so ask them. They should be happy to answer any questions.
Most salons are not very experienced at unnatural colours, and even bleaching can be a stretch for some (we have a whole thread on salon bleaching horror stories) usually because they are trying to rush the process/work within time constraints.
A really good salon should do exactly what you want though, be honest and realistic about the time frame and always offer skin sensitivity tests and strand tests.
So don't assume you will get a good job just because you pay a salon to do it, some of the worst dye jobs I have seen have been done in salons, the members of this forum would do a much better job. Do a lot of research and ask a lot of questions. ideally go to a stylist whose work you have seen (in person) and like.

Totally depends on the salon, and the colour required/products used, so ask them. They should be happy to answer any questions.
Most salons are not very experienced at unnatural colours, and even bleaching can be a stretch for some (we have a whole thread on salon bleaching horror stories) usually because they are trying to rush the process/work within time constraints.
A really good salon should do exactly what you want though, be honest and realistic about the time frame and always offer skin sensitivity tests and strand tests.
So don't assume you will get a good job just because you pay a salon to do it, some of the worst dye jobs I have seen have been done in salons, the members of this forum would do a much better job. Do a lot of research and ask a lot of questions. ideally go to a stylist whose work you have seen (in person) and like.

This to the letter.

I get much better cuts and (normal-ish) colours from hair academies than professional salons because the students are forced to take their time and are very carefully supervised. Plus, they're a hell of a lot cheaper!

Where in the UK do you live?
What colour is your hair now?
What do you ultimately want?

Hey Puppyshark.

Originally I have Asian black hair. Currently I have medium Brown hair (with orangey/reddish pigments)
I used a blonde dye to get this brownish colour (I have a thread of this in the: lighting/bleaching section titled: hair colouring advice)
That's why I'm considering going to a salon/hairdressers. Ya know? Experimenting is fun but if handled incorrectly, you could have regrettable results. This option is much easier and hassle free for me.
I live in the North West region. ^^

usually because they are trying to rush the process/work within time constraints.

But also, sadly frequently, because many just don't really understand the chemistry going on when they're colouring.

Trust me, it's as much of an experiment to use a salon for bleaching and colouring as it is to do it yourself. The problem with asking about salons here is... we've mostly all had bad experiences in salons and/or have been doing our own hair for many years.

@Janine
@WickedPixie
Ikr? Even I don't fully understand the chemistry of colouring LOL.
Is it possible to tone out orange/red pigments? Or even like a purple/blue Shampoo?
The thing is I would have to find a Brown hair toner (which is easy to find I think) so it doesn't turn out blonde.
For what shampoo I don't know (these are harder to find here, but you can get it online) what colour to use that counteracts the red/orange pigments and makes it stay Brown and without it making blonde. Because that's what realistically would happen if you used a purple shampoo right? Their supposed to fix brassiness in dyed blonde hair and possibly other colours..but I only used blonde to achieve that Brown effect. XD

For now I want to make do with this colour and after my roots have grown out and the colour, I'll use a high lift dye then c:
Seems reasonable.

I don't expect you to know now! But you can learn.

Shampoos can not, ever, make dark hair blonde*. They can only add colour, not take away anything, so therefore, it can not lighten dark hair. All purple shampoos do is add a fine layer of purple pigment to already blonde hair and make it appear less yellow. If your hair is brown, it's not going to do much of anything. It'll subtly remove some of the yellow tones, but as the red is darker then it's not going to show.

Remember, both of us are in the UK, so we know what you can get here. I'm also in the north west region, but only moved here a year ago.

You don't have to have a shampoo. Unless wicked pixie has a better idea, I'm not good with browns -I'm not normally white blonde as in my profile, normally I'm bright unnatural colours- then a green or blue dye, depending if it's more red or more orange, diluted in a conditioner will work. And the good thing is, if it doesn't work well, a few scrubs with a string shampoo will take it out. You can get green and blue dyes on www.beeunique.co.uk

*Edited to add. Well, there are some that maybe can. They can't make dark hair blonde, but they can possibly lighten hair a teensy bit. But that isn't purple shampoos which are intended to tone yellow hair. They are blonding shampoos that make already blonde hair slightly brighter... Or so they claim.