Perform a Pre-Season Kit Check
It may sound obvious but it's important to check your kit before you go climbing. At the beginning of the season I recommend a thorough kit check, particularly when you've been using your gear for winter climbing, which can cause considerable wear and tear.
Feel free to use this list as a check list to help you work through your gear.
Wash and run your ropes through, check for physical damage, furring, kinks and wear. Do the same with your prusiks.
Check your harness for signs of damage and fraying, particularly at the wear points such as belay loop and buckles.
Check your rock shoes for their fit, comfort and of course, the amount of rubber that's still left on those all important edges.
Check all your karabiners for damage, nicks, burrs, rusting and flaking.
Check all those slings you've been using for winter climbing for fraying, furriness and especially little nicks across the all important width of the sling.
Run your fingers around the surfaces of your belay devices to check for nicks, burrs or other damage and check to ensure they are compatible with that new skinny rope you've just bought.
Check your nuts! Carefully, run your fingers along the wire checking for breaks in the individual strands and any signs of rusting.
Check all your Cams, friends, SLCD's moving parts for serious kinks and non-return.
Check all your Quickdraw karabiners are orientated the way you want them, same direction gates or opposing direction gates.