Any solder tips or tricks?

youtube.com/watch?v=IpkkfK937mU

watch the video twice and practice

Soldering is easy.

DEsoldering can be a bitch, though. Watch some youtube vids.

what if the tin just rolls off the tip

it's too far gone then. buy another one

Anyone experience with reflow soldering?

I want to buy this board
topledlight.com/aluminum-pcb-board-42-spots-82mmx66mm-for-cree-xpe-xpe2-xpg-xpg2-xte-led_p1635.html

And fill it with Cree XP-G3s.
Anything I should know before buying everything?

Can I just use a skillet for it?
I don't have a reflow oven and a hot air pistol probably isn't too ideal for a 42 diode board.

I've looked up some tutorials, but there isn't anything indepth.

SOLDER TO NASA STANDARDS
nepp.nasa.gov/docuploads/06AA01BA-FC7E-4094-AE829CE371A7B05D/NASA-STD-8739.3.pdf

I assume you've never tried to do tight-ass SMD soldering without a stencil.

Add more flux.

one time i recorded simple tutorial on GPU soldering, here you go

i also recommend looking for proper soldering examples on stockphoto, i think i had couple of them saved

i can't find any videos (man, those were fucking brilliant) but at least i found this fine example of soldering a sponge