Hi Cath
I've done 2 courses covering tinting & would say that even if you know how to do it I wouldn't as being qualified means you have learnt all the contraindications & how to do a patch test, ingredients, salon standard (how to use the products / time frames etc) but also what to do if something was to go wrong!
I would say this is really something you should be fully qualified in before doing it on the public.
I had a client that had an allergic reaction to the tint. (Luckily I had done a patch test so the reaction was behind her ear) It came up in a massive lump & was red, itchy & flaking.
Can you imagine if that had been on her face / eyes!
I think you can do individual courses at some schools. although again check the qualifications are recognised by local salons (even if you don't plan to work in one! nothing worse than paying out for a course to find your qualification isn't recognised)
Hope this helps
Carla