My son dropped his 4th gen ipod touch and shattered the screen.
Purchased the screen and recommended tools from the product page. Everything went well following only the guide from this site. The most difficult part was removing all of the shattered screen pieces. Son is once again happy as a clam.
Definitely recommend the tweezers. The plastic opening tools worked well, but will only last for 1 or 2 repairs. Or at least that is my experience.
Phillips #00 Screwdriver
Metal Spudger Set
iPod Touch (4th Gen) Display Assembly