i will be done with my first test e bulk cycle in late feb and then will be starting pct for a month, i want to know when would i can start cutting?

im going to clean up my diet, lower the cals, and use some supplements, but i want to make sure i give myself time to adjust to the new bodyweight because i heard if you dont you will loose it all.....

any suggestions when i can start the cut

also, any suggestions on a good cutting stack