I don't have a video, but I got a few tips.
1. Make sure you take a good look at the current one so you know how it should sit.
2. Keep the trigger in its most forward position. Tape helps.
3. Make a slave pin. This helped me on my USP. Use it to keep the spring in place and help line it up.
Just be prepared to walk away from it for a bit. The first time can be really frustrating.