Did StrongLifts. Got gains. The only injuries came from my Krav Maga instructor. ;-)

It is not for the beginner. Squats are difficult to do correctly and I spent about an hour watching videos before I attempted it with a personal trainer. Then I kept watching videos to improve form. It's not a simple exercise and it is easy to perform it wrong. Barbell rows are easier to learn but also easy to perform incorrectly. Bench press is pretty safe. Overhead press is pretty safe. Deadlift is worrisome but not so much at the low starting weights of the 5x5.

I would recommend watching a lot of youtube tutorials on how to do the exercises correctly. Do a complete warmup before lifting. Hire a personal trainer who is a weight lifter to make sure you're doing the exercises correctly. Then you can feel comfortable doing it on your own.

If you have a mirror and you start with light weights, you can monitor yourself for form. Yes, there's a bit of due diligence involved, but it ain't exactly rocket science...

That having been said, the importance of doing all of these exercises with proper form cannot be overstated.

Start with x repeats, then count to 20, do x•2, count to 20, do x•3, ..., until you tired, e.g. x•5, count to 100, then do x•4, count to 20, do x•3, count to 20, do x•2, count to 20, do x repeats in row. X can be 1, 2, 3, 4, 5, etc., e.g. 5, sp, 10, sp, 15, sp, 20, lp, 15, sp, 10, sp, 5, lp, an another exercise...

Important NOTE: Each of downslope repeats must feel like top repeat, i.e. you should be equally tired for X•N, count to 100, X•N-1, count to 20, X•N-2, and so on. If you are not tired, then increase X or weight.

You just do 5 sets of 5 reps for a couple of exercises... that's really all there is to it.

>I can't do pull-ups very well

Funny it's the opposite for me. I can do pull-ups all day long but still struggle with bent-over rows to this day. TBH I don't really do rows anymore. I just hold a dumbbell between my thighs and do pull-ups.