hello zzagalo, or re hello from last time
you need at least 2 1/2 experience as an aircraft mech/tech/engineer, and that's your case(faa will need your job tasks to see that you covered all the ATA's)
secondly to be authorised to pass your a&p you will need to be sponsored(US company that you work for or for who you will work when faa a&p in the pocket)
than go to an faa school and take your theory and oral&practical (school + exams is 2 weeks)
hope this helps