Quoting from the test taper thread
"Cycle ends, stop hcg if using,
start Waiting peroid:
Week 1-6 or 1-4: Test E 100mg per week
Taper off Arimidex or femara fully by week 3"
So as soon as your cycle ends (your last shot) you jump on your stasis period of 100 mg of test and stop using HCG (if applicable).
"During the waiting period you should taper off any aromatase inhibitors you are using - basically get rid of all drugs in your system besides testosterone."