Well I just did this today so I thought I would post up for anyone still anxious about it. It really is super easy and took me about 20 minutes.
So here is what you are starting with... a factory bumper
The idea here is to remove the lower portion to help with your approach height for obstacles.
So we start by making a line on either side where we want to cut... these are the only lines you will have to make for the entire job. Just take a straight edge and follow either the top or bottom line on you side turn signals. I would recommend the bottom line (contrary to the pic)
Then you can start cutting from either the outside or the inside. You are just going to follow the natural line in the bumper all the way up to your line you drew. It's very easy to follow (just make sure it's the correct line) The middle is not attached to anything so there is nothing to cut there. I used some sheet metal snips and made quick work of it. I have heard that a dremel or rotozip can both work well for this. Don't forget to drill out the rivets in each wheel well. It should be just below where you drew your line.
After you do your trimming the front cover should fall away.
The inner valence is held on by 8 metal rivets and 2 plastic things. Go ahead and drill out the rivets (one side shown in pic)
The 2 plastic things should just pull out with some persuasion.
So now you should be done... you can take a file or sanding block and clean up your cuts if need be and touch things up.
BEFORE
AFTER