As Josh and Ed said, keep the Lazy-8s slow. It's easy to come out of them high and slow or low and fast. Roll out of that bank half as fast as you think you should, otherwise you'll end up 30 or 40 degrees short of your 180 degree heading.
In Chandelles, don't be freaked out by the stall warning horn. As I learned them, I end up being just below a stall for a significant portion of the last 90 degrees. As long as you stay coordinated, pushing to far and actually stalling isn't a big deal when your practising.
Finally, in the spirit of coordination, stay on those rudders! If not already, you'll soon be able to feel it in you butt (seat of the pants flying at it's best!) without having to look at the inclinometer.
8s-on-pylons call for a stabilized entry (well . . . so do the other maneuvers . . . ). Have your airspeed and trim nailed. Then, make small adjustments. Don't over correct or you'll be porpoising all the way around the pylons. Instead it should be a slow, gentle descent on the upwind and a slow gentle climb on the downwind.
I'm sure there's better advice out there, but I'm right in the middle of getting ready for my comm checkride and those are the things that helped me . . .