There is lots of good guides on here and some really knowledgeable posters, so I think you will be fine. Just follow the steps really closely.
Here is the thing about rooting and installing a new ROM. It isn't as dangerous as it may sound honestly. You are really only installing software and the likelihood of truly bricking your phone is almost non-existent. If something screws up and even if you didn't have a backup, there are stock Roms available that you can put back on your phone.
Now, this isn't without risk. You are voiding your warranty and while you can put your phone back to stock quite easily if necessary, you could be in trouble if your phone develops a hardware problem. Let's say that your USB connector goes out. You would not be able to restore your stock ROM (actually it may be possible, but it would be far from trivial). Taking your phone back to Verizon in that state could be problematic.
So it really isn't the rooting/roming that will cause problems initially. It is if you have a hardware problem down the road, you may be out a phone.
Not trying to freak you out, but just trying to make sure you know what you are doing. I am actually pretty happy that I did this and after using Bugless Beast for a while there are definite advantages.