Eric,
Welcome to the club. Your idea sounded just fine, but I'm down here in the southeast in the midst of Hurricane Jeanne so I'll wait until the weather clears before I try it.
You likely will find that there are about as many styles of treeclimbing as there are treeclimbers. Every climber, it seems, does one or two things different than other climbers. I guess that's because it's still a new recreational activity and is open to a lot of innovation and improvement.
I, for example, like to make my initial access into the canopy by single rope, then I will switch over to either a double rope or another single rope as necessary for my advances on upward into the treetop. If I'm doing a transfer between two single ropes, I carry either a third ascender or a Prussik loop to use as a safety while making the switch. When descending, I use a rappeling rack (the mini-rack with two hyper bars does best for me) that I put on the rope between my upper and lower ascenders. I then stand up with the lower ascender, slide my upper ascender down for slack, put all my weight on the rack, remove the lower ascender, then finally remove t he top ascender. I keep the gate open on the top ascender (and keep it attached to the delta on my harness) in case it's needed in an emergency situation. The rappeling rack gives me a nice, smooth ride to the ground and I can control the rope with just two fingers.
Again, welcome to the treeclimbing (we decided to make it just one word) community.