1. Saving your work often can save you alot of frustration (easily forgotten until it's too late).
2. Every once in awhile, it's good to save as a different file name in case you need to go back to a previous version of your model.
3. Computers can crash. Every once in awhile, save your work on a jump drive or disc, etc. If your computer crashes for good, you still have your work.
Don't be satisfied with what you can do but rather strive to do the things you can't do!