RW82,
Hello! I cannot say for sure what you will go through - it is fantastic that you are doing this under a Drs. supervision.
I recently weaned off of Toprol and experienced some pretty severe headaches, heart poounding, vision disturbances, and head pains. Each day these have become less and less. I drink a lot of water, try to relax as much as possible, and monitor myself to make sure nothing gets out of hand. I go to bed earlier too

(Just so you know I was on Toprol for 5 years went from 50mg to 25mg to none - I will be starting a diruetic soon).
Just take it one day at a time and with your Drs. Supervision you will get through the lowering of the dosage just fine.
Take good care of you.
Vanessa