Watch a few Youtube vids on learning how to solder.
AND, have a fire extinguisher and a five gallon bucket of water right there.
Insulation, drywall, framing, siding, can all catch fire and spread fast.
You can also get small fiberglass cloth flame shields, about a foot square, to put over areas that will be too close to avoid.
Also, wet down anything flammable with a spray bottle of water, just damp is good enough.
And practice on some scraps of pipe and a few cheap fittings.
Start out soldering horizontal.
Then vertical, solder going down.
Then vertical, solder going uphill into the fitting.
Look inside the joined fittings afterwards, if you see more than a smidge of solder inside, you are putting too much in.
I like to heat the fitting, never the pipe, till I see some bubbling of flux, touch the wire to the joint, it should start melting, take torch off and move the solder all around.
It melts fast and the wire will quickly shorten, so keep moving it in.
On a big fitting, I might torch a little on the opposite side as I add the final solder.
If you can’t access 360 degrees to add solder, 270 is usually enough.
If you are soldering a fitting with anything flammable inside, like a valve with rubber washers, take those parts out first.
This will all be in videos.