I only have one spinning rod so I often change my approach with just one rod and reel. I keep a snap swivel on my main line and then clip on different rigs such as texas rig, dropshot rig, etc. Any body know a good way to keep them once you take them off without the line getting tangled on itself? Do you guys snap on different rigs too, or cut the line and start from scratch each time?

Walleye fisherman use a tool to store numerous types of crawler harness's. I would bet the same tool would work more than perfectly for you.  just google crawler harness storage.  Another very inexpensive idea would be to buy one of those foam noodles that children use in the pool. try and find the ones that are smaller in diameter than the large ones most places carry. cut it to size and just wrap your line/baits around the foam and inset the hook into the foam. you can also go buy a wooden dowel from any home department store and then buy some foam pipe cover insulation and slip it over the dowel and it will work the same as the noodle.

Check the line for knicks, scrapes, cuts, abrasions and cut out the damaged portion.

 

Always use fresh line when possible.

 

Cut line and change rigs to know that they are correct and the probability of losing a fish is minimal.

A snap is just one more thing to fail IMO. Unless I'm using one on a bait that needs one to get better action I'm always going to tie direct. Doing this also makes it so you don't get lazy and fish the same knot for too long and lose a fish to abrasion.