Yes you'll be fine. IME I hate lead free solder because of its working characteristics (and this coming from a guy that is by no means a beginner), difficult to melt (i.e. needs more heat which in some cases can damage components) and looks strange even when the joint is proper (i.e. a proper LF joint more or less looks like a poor leaded solder joint), and I too use a 25W Weller Professional iron (also sometimes a cheap 40W station). I'd follow tmdazed's advice because it is absolutely correct.
On a related note, tin has a property whereby it can sprout random tiny hairs that eventually cause short circuiting, which in my book is a big a$$ no-no. (Here's a better explanation.
) This is the other half of the reason I don't use it.
EDIT something else I should mention about the whiskers, is that people have tried, for example, to coat finished boards etc. with insulating material (glue, liquid tape, you get the picture) to prevent these whiskers, which is an exercise in futility because the whiskers can pierce things like that without much issue.