hi, i too have picked for years. i am now on accutane, i have still picked but obviously not to the extent it was.. however doing so is asking for scars, especially on accutane! anyway i know how you feel, i myself am going to see a therapist.
in the UK you can talk to a support group called talking spaces. i think the only tips are avoid mirrors. seriously.
but do get help asap. i picked for about 6 years and i wish i hadnt, i have minor scarring because of it, its depressing! the sooner you stop for good the sooner your skin can heal and you wont cause further damage.
its like a smoker, how much damage you do before you quit is entirely up to you.
regarding the infection, see a doctor asap! also consider accutane.