I'm taking A level chemistry and biology as a private candidate and I'm going to try to do all 12 practicals within one year along with the exam papers ( as I need to get these a levels within a 2 year period).
How hard are the practicals for AQA and are there any examples online which I can practice upon as I have no clue where to look. The center has told me it will only test me not show me anything.
Not hard at all.
Usually they tie in with your studies so I'm not sure how that would work as a private candidate.
We were given a practical sheet for each one with was basically a step by step guide
You'll pretty much pass for remembering how to breathe.
In all seriousness though, you'll have no issues if you just follow instructions, especially since it's all internally assessed.
(Edit) Just read your post properly, so you won't have it assessed by your school/college, but you'll be able to find instructions and just follow them, so there'll be no problem.
The organic chemistry practicals get quite tricky but if you have good research skills you will find helpful videos/papers out there. The biology ones are basically "cut the celery and look at the pretty purple holes". Do you have access to a laboratory?
The AQA website should have a teacher's guide for the practicals (pdf) which help you out with how they are marked and stuff. However to pass AQA practicals you need someone watching you do it. I'm not sure how you'll do that. Are you just joining a class at the centre for practicals?
Where are you doing the practical endorsements if you don't mind me asking?
Even I'm doing Biology/Chemistry as a private candidate and will be doing the practicals soon.