Also try grabbing what you think you'll need then taking your laptop if you have one and go and work somewhere without internet. If your laptop has a 3g modem leave the sim at home, leave your smartphone at home. You don't need the internet all the time.
Not when using tools that are unfamiliar. It's really really hard to fight the urge to Google "how do I XXX in YYY". Even though I have an online documentation browser (Dash), I still Google first; it's much faster.
