My quick advice is (1) go light at first [nobody cares how much you lift] (2) go slowly and try to feel tension in the correct muscles for the exercise if you don't know which muscles you should be feeling you should look it up (3) go over form very carefully with videos or a trainer
If you can't afford to hire a trainer, start with going to a weightlifting group class to learn technique. Even Crossfit is good for that (just don't learn your pull-ups there :)). At least you will have someone correcting you. Once you're confident in your technique you can quite and start following your own program.
Also - CrossFit-style pull-ups might be a little goofy, but CrossFit burpees are the way to go. :)
Because I work out three times a week my life is better on multiple fronts, including my concentration and coding.
Two years on I’m down 27 pounds and can do push-ups. I have never been able to do push-ups.
The problem with both is that they overindex on squats and on 5 rep sets. You want to get a mixture of the number of reps you do per set, and doing squats as often as they recommend will turn you into a t-rex. Plus, when you fail at a certain weight (which you're bound to do), then there's not the flexibility necessary to help you push through and so you get frustrated. I know--I've been in that situation with both programs.
I've recently taken up GZCLP[1] and I'm very happy with it. I'm already doing, 3 months in, more weight than I was doing on either SL5x5 or Starting Strength, and I'm over a decade older than I was when I did this programs.
If you can, get someone to help teach you proper form when you start. It’s much easier to learn once, without needing to break bad habits.
https://aasgaardco.com/store/books-posters-dvd/books/startin...
He also has videos on youtube demonstrating proper form.
Funnily enough, when I tried couch-to-5k it I had to pause to recover from shin-splints aka tendonitis.
Now I've started bouldering more than usual, I'm getting climbers elbow (tendonitis) as well as other pains in the wrist and forearm that are not muscle-related.