5x5 is a dynamite program.
It would be a good idea to find your maxes first -your true maxes, that is.
Simply take a week and, for example, max squat Mon -bench Wed and Dead on Friday.
Not your 1rm, but a true 5 rep max for each lift. Then you’ll be armed with the knowledge you need to succeed.
Start conservatively -otherwise you’ll blow up the program. You’ll make it a few weeks and stall.
Start a bit light. The first week should be relatively easy. Don’t worry, you’ll be busting your butt soon enough.
Follow the program and don’t fool with it. Don’t add work. If things are going a bit too easily for you -rep out on your last set.
Believe me, you won’t be doing this very often. The workload is hellish if you truly bust your butt and work to perfect your form.
Even advanced trainees can benefit from the Intermediate plan.
Eat, eat and eat some more
Sleep as much as you can and drink plenty of water.
I gained 30 lbs on the 5x5 over 16 weeks.
My clean jumped 45lbs
Squat improved by 30 lbs
OH Press bumped 25 lbs
That’s after a lifetime of lifting too (43 yrs old)