A couple of months ago I switched to the big lifts: squats, deadlifts and bench presses (and OHPs, rows, and lat pull downs).
I am exhausted after the big three lifts. Breathing is the most difficult part when squatting. I am tired afterwards. How do you still find enough energy to do accessories?
I am also still learning the lifts. It’s incredible how long it takes to master them.


Well you’re surely doing it right! As others have said, the best thing to do would be to split them up to different days but I understand it’s not possible. Maybe as you are still learning them they take an extra “mental” toll over you and it will get better in time. I don’t see anything wrong with doing “just” the big lifts and being totally kaputt after them ;)