Jeans should be ok, you need to be comfortable but avoid going on your pjs.
You don't need to take a laptop, it's probable that you won't use it at all.
Luis C.
General Disclaimer:
Are you seriously taking the advice and code from someone from the internet without testing it? Do you at least understand it? Or can it easily kill your server?
How to post data/code on a forum to get the best help: Option 1 / Option 2