> Flux, the secret is more flux.

And patience. As tempting as it may be, don't think "if I double the temp, I won't be waiting for this big joint to start pulling in solder".

good flux, clean/sharp tip and proper patience can take you a very long way! (a steady hand and good rubbing alcohol will take you the rest of the way)

I haven't found flux to make much a difference at all to the problems I have with soldering. It turns liquid, and nothing happens still - and I've gone through a bunch of fluxes at all brand levels.

More flux, and a stash of old lead/tin solder...