Is it Ok to tweeze hairs before they shed post-treatment?

Does that sop them from shedding or does it not make a difference?

No. Allow the hairs to shed naturally and do not tweeze any hairs during the course of your treatment. You will be lengthening your treatment time and seeing less results. You can use tweezers on the hairs but if there is any pull, leave the hair alone…only allow hairs to be removed that slide out naturally.