I use to be an absolute horrible at soldering and I had I don't know how many piece of junk irons. Now and then things would turn out good and I would try the same technique again and it was back to crap. I even thought I was a pro with nichrome then next time I wanted to pull my hair out. The proper solder type and flux is important yes, temperature is even more important. The quality of your iron especially the tip is critical, Look at it this way I must have bought about 5 or piece of jun one k non adjustable irons over the years at $20 to $40.each plus single core solder way too thick for the job and only one Weller throw away had slightly decent tips.
Then one day I came across Dave Jone's EEV blog on you tube and watched a ton of tutorials, lots of great guides, especially for beginners who have no idea why their joints are crap. When I accepted there was only one solution, I dropped a hundo on the Hakko FX-888D solder station ready in about 20 seconds digital adjustable even came with great cutters. Now life is good and so are my solder joints. If you solder at least 2-3 times a year and it's for delicate or expensive applications, even if it's not, bite the bullet and save cash in the long run. It was the best $100 I ever spent.
Just make sure you watch his tutorial and get the gauge solder and learn how how to handle you tips, That's all you will ever need unless your doing a lot of SMD work, or are desoldering hundreds of components, and even in that case I'm sure the FX-888D will be part of the action.
* Note there are other high quality brands like Pace, Weller's Pro Series and others, I just prefer Hakko for several reasons, & that model is excellent!
Anyone can solder given the right materials, even nichrome will be a cake walk