Roger,
Just like any other nose cap, with one exception, a short piece of ramrod wrapped with wax paper and aluminum foil, so it can be removed when you're done.
It's pretty easy, just make sure all the corners are sealed with wood scraps, clay, and good masking tape to prevent any leaks.
Preheat the barrel, so your metal doesn't cool too quickly.
If you were still,around here, I could help more.
Good luck.