Actually, my husband did this repair, with my assistance. This is his description of the process.
I watched several YouTube videos and gained the confidence to try the repair. The most challenging part of the process was disassembling and reassembling the dryer. My dryer is different from the one in the Appliance Parts video, but I was able to find another YouTube video that showed me mostly how to proceed. A little improvisation was necessary because even the video with my dryer's model number on it did not show my exact dryer. Pay attention to how many bolts are removed at each step. When it came time to reassemble the dryer, I found that there were more holes than bolts, so choosing where to place the bolts required care.
Removing the old parts and replacing them with the new parts was the easiest part. The only challenge was removing and replacing the triangle retaining clips. The video makes this look quick and easy. In truth, it takes a bit of fiddling and some good finger strength. Be prepared for a lot of dryer lint. Having a vacuum cleaner handy is highly recommended.
Putting the dryer back together also requires following the instructional video carefully. The most challenging part was getting the new belt onto the pulley. This has to be done only by feel - the dryer drum is on top of this area, preventing a direct view of the process.
Although I did not have the experience of finding any obviously worn parts, when I completed the project the dryer did indeed work well without any squealing. There are other videos that suggest just taking the dryer apart, lubricating it and putting it back together will solve the squealing problem. For the modest price of this repair kit, knowing that the hard part of this job is the disassembly and reassembly of the dryer, I chose not to take a chance on that approach not working.