Welding help

Tackle out a few exhaust builds and then do it yourself and bring a grinder. Use a mug welder that takes gas. Watch a few YouTube videos. If your welder thin metal to thick metal move a bit slower while on the thick side an faster on the thin. Keep your wire pointing towards the weld. Go in circles. Move away from the weld. Carefully grind away the excess.
Also don't start at the beginning and go all the way down in one long weld. You will chance earlier g your metal if you do. Instead tach weld ever few inches or a foot depending if your metal is sagging down. Then weld a few inches at a time.e and jump around a bit to keep the keep the heat down.
After your finished you should be close enough to use a filler primer on it. Keep the gun back a bit so you can get a bigger build without it running on ya. May have to prime and sand it a couple times but fairly simple if you practice a bit.