one other thing

i found that soldering to read points and ground points was very difficult and i had to keep the soldering iron on those points for a little while to warm it up but still wasn't getting a lot of luck (problem with that is that you can burn some traces on PCB as well if it gets too hot)

i donno if it's my iron or what but it's more difficult than i thought
would be good to get some tips from more experienced guys why that is