[quote name='nick' timestamp='1390939789' post='2351605']
Your 30w should be OK for pedal building - I use a 25w myself.
I use a 60w for soldering to guitar pots, earthing etc.
[/quote]
This, If your iron gets too hot (60W etc…) then you'll destroy the bond between the PCB and the copper track, meaning you've knackered your board. If you're doing PCB stuff then I'd always recommend lead solder as it flows at a lower temperature than the lead free stuff.
Doctor Tweek has some stuff on here that's brilliant.
http://doctortweek.co.uk/shop/article_541/Solder-22SWG-(2-meters)---Low-Temp%2C-Fast-Flow%2Cproper-solder.html?sessid=23uqMJP6jhTe9LWNwSkQYi6XzMr3FYkKctXNf0r9iVSkCR4iYfINbcdBiXif9Ouv&shop_param=cid%3D19%26aid%3D541%26