You're going to find the biggest headache is going to be getting the clamp loose for the small hose that pig tails off the filler hose. I've done a few of them and have always managed to get them out so I am sure you can too. The only trick I have found is in trying to get the hose and clamp to spin around enough that you can get a tool on the screw head and back it out. The clamp is usually put on so that the head faces up and it is far enough over from the access hole that you cannot get a straight shot at it. You will find yourself working from the top and the bottom to get that hose out and replaced. I would not want to do one of those darn hoses laying on my back but you have to do what you have to do.

When you go back together make sure you put some kind of lube on the hose so it slides back on easy enough. You are going to be fighting enough stuff under there you don't want to have to wrestle the hoses back on as well.

Mark