Nice build, But i'm scared to delidded my CPU knowing my luck my CPU will die
The safest way is to use just the vise, smooth-jawed one, not the one with the rough or grip-bump surface, google vise-only delid.
The next best is to use a utility cutter blade, not the thin safety razor kind, but the kind with angles on both of the ends. It's not thick enough to damage the board, but it is thick enough to cut through the glue, and act as a wedge at the same time, and thick enough that it minimizes the risk of nicking the board by raising the edge above it more than with a thin razor.
I had tried first a few weeks back on my wife's suspect 4770K (the ASRock Z87E-ITX that it was in ***SMOKED*** a MOSFET (LITERALLY!!)), so, seeing that it was out of warranty anyway after previously lapping it's IHS to a mirrored finish, I figured what the heck, it needed it anyway because of absurdly high temps. First I tried using one of those thin safety razors, the kind with the folded aluminum on one side. I was getting creeped out by the mount of pressure needed, and the fact that I wasn't really even getting anywhere with it.
We were going to buy a vise, but then I started thinking about the thicker utility cutter blades, and high school physics (wedges), and the fact that such blades are VERY stiff. I did hers in about four or five minutes.
I did mine today in probably two minutes or less.
There are MANY videos, showing both methods. If you choose the razor method, PLEASE use one of the blades like I did, and be very careful and keep it flat against the board, do not angle up or down, and know that the VR components are on the left hand side of the board, and their general position. You do not want to nick the board, and you do not want to slice your finger off.
If you have any concerns, seriously, google "Vise only delidding" on Youtube.
Temp drops are between 10C and 30C. The average is between 10C and 20C. I got 14-16C drop.
If you exceed 70C on a regular basis under water, seriously consider this. There is a REALLY GOOD guide, and tons of advice over here:
http://www.overclock.net/t/1313179/official-delidded-club-guide. Just make sure you know the risks, and understand that it voids the warranty.
Late Edit: Oh, and if you are interested still, please also watch the disaster vids on youtube of people who did it wrong. It's always good to know what NOT to do. There aren't actually too many of such videos, as the vast majority of people do it safely and successfully. Just please educate yourself first. The link I gave above has a list of really cheap (like the Celeron 420) chips you can practice on, as well as the list of known Intel chips that are NOT soldered under the IHS. Do not attempt this on your Sandy Bridge, for instance, it's soldred to the IHS, so that's as good as it gets, and delidding WILL destroy chips of that family.