The YT video for changing my cars' front light bulbs was less than two minutes. After half an hour and a lot of scratches / bruises, I thought I got it done. Started the car, checked the light goes on and off. Scrub hands from dust and dirt, be happy.
Mandatory inspection two months later found out that it was pointing so badly off that their targeting device could not even get a reading. In other words, I had been blinding oncoming traffic. Car didn't pass inspection, I was defeated, and took it to the mechanic.
He also spent twenty to thirty minutes on readjusting the bulb, before it was done and up to spec. It costed only 15 euro, though, as they also expected it to be a 30 second operation.
I guess my point is, don't get discouraged when things don't work immediately, or don't work exactly like a manual / video makes you think. Often it's a learning experience, and while those can be fun, they also sometimes are very much not.
(I'm also a complete novice, and not particularly enjoying the experience, just not affluent enough to pay for all of the maintenance work.)