New
#11
Once built, patch it and take a system image.
Keep your downloads and data on a secondary partition or hard drive...thus you could put your image back down with 0 loss.
Run an AV and malware scan.
Don't download and install stuff you don't absolutely need. Consider taking an image before playing with something. Restore image if it's not everything you hoped for and more.
Do everything on the web inside of sandboxie using the sandboxed browser.