[Eliot Ness]

Yeah, a 100 watt gun is probably most of your problem.  If you don't want to spring for a soldering station like the Weller WESD51 or WES51 you can use a 25 watt iron or maybe even a 45 watt if you're careful.  I prefer a temperature controlled iron, but an el-cheapo like the following will easily get you by:

https://www.parts-express.com/variable-w...s--370-340

Look at the 2nd review by the guy in Lexington.... he is a friend of mine and he loves that iron.