What he said.

However, I didn't enjoy doing squats because it hurt my back.

Instead, I used the machine where you sit low on the floor and your back is supported, and you push the weight up on an incline.
I really didn't spend much time on my lower body because it responded more easily to training. I spent much more time on my chest, shoulders, and lats to improve symmetry.

I would do everything again except for the steroids, and I wouldn't strive for bigger size. It's not necessary to get "bulked-up". I would just want to be healthier: improve strength and increase lean muscle mass. Having a higher percentage of lean muscle tissue raises your metabolism. Fat is inert and doesn't burn calories. Muscle, even at rest, burns calories.

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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".