Oven stop heating

I went online to find the part. I also found a how-todo it self installation instructions. So, I thought I would try it. I pulled the stove out and unplugged it. It took me 2 days to try and remove the screws. They wouldn't budge. On the second day, I was about to give up. I tried to loosen the screws again. It finally moved!! So, I kept at it. Took me about 10 mins on the first screw. Then another 10 or 15 minutes on the second one. Once I took the screws off, I didn't know how to remove the wires. I kept picking at them for about 5 minutes, and it was easy then. Removed the old bake element. Then connected the new element wires, put the screws back in (not tight). Plugged it up and tested it. It worked!!!!!! I've never did anything like this before. If the screws wouldn't have been so hard to remove;it would have went a lot better.