1. Millions of computers go through the upgrade process all the time and the percentage of failures is quite low.
2. Unfortunately Microsoft can't account for every possible combination of hardware, drivers, security software etc so yes failures do happen.
3. Underlying issues with hardware can cause corruption which could lead an already unstable install to derail quickly.
Most important points. We are not affiliated with Microsoft nor are we paid to assist people, so no we won't remote into your computer and upgrade it. This forum is 100% volunteer and here to offer advice and make suggestions for people to fix their issues.