Don't feel too guilty. I did the same thing on an old MacBook when I started out repairing Mac laptops. Luckily it was a "practice" laptop to experiment on and wasn't an actual job. Im glad it happened then because now I am extra careful when doing RAM upgrades for friends and clients.
There are many delicate and extremely small screws, parts and wires inside a Mac laptop and no matter how careful you are, something could be pulled off the logic board. When this happens, sometimes a part can be soldered, sometimes not and the logic board has to be replaced which is expensive to do.
The only way I found out about repairing Mac laptops was getting old practice machines that people were throwing out anyway, opening them up, taking them apart, trying out various tools, and studying the inside with a magnifier light.
I always use a Black Stick spudger to gently tweak the RAM clips on laptops to check the resistance. I have had some laptops that it took both hands and a lot of push to get the RAM chip seated properly. This usually happens on the older machines. Good luck though next time