Looks simple to me, too, but I don't think I can bring myself to do it. One tip I read mentions washing the van after to remove tiny metal shavings that might stick to the exterior and rust. Makes sense.
Having trouble finding local installers. In fact, looks like a minimum of $20K to get in the door. That's causing me to lean toward the dark side and consider an older Class B (again, some more), even though we don't need all those "features." Sigh...
My think re awning windows, too. Again, read a few cautionary tales. I think you will like those sliders. We love ours (below picture windows) in the 'ole conversion van and just can't give them up!
Belated congrats! Have fun!