I kept my rest between sets pretty short, and during my warm up sets also, pretty much the time to load the plates.
Don't add extra to the program, just follow as he describes it. Focus on the main sets. Good form counts , but there are grinding reps as you increase, that's ok in my book
Eat for your goals.
Keep your balance in life, training is a lifetime pursuit, but put the work in regularly , don't freak out if you miss a session, make it up the next time you lift
Good luck and enjoy, you will be living a little history as you train.!