Nothing more dangerous than an out of practice glass guy on a curved windshield, but it shouldn't take much "long arm ops" All slap work should be out by the A-pillar, the centers follow well.
Lube and rope...ignore the dirty thoughts
Start at the bottom hook the gasket on the edge, as soon as you get past the first corner, as long as those corners are over the lip, light "clap slap, inside and out at the same time on the edges should keep it down. Once you get to the top corners, it should stay where it needs to be
Once you get to the final more "clapping" moves it one way or another for the final seat as the rope comes out
The tough parts are getting the chrome in the seal, and it's a bear if you have a crappy rubber gasket, new and soft it should be pretty easy, and carrying a big long glass, best to use two people rather than your hands in the middle. Always remember, movement has to be parallel to the glass, not perpendicular. It will move, but it won't bend
Whoever you have do it, be sure to ask who is responsible for a broken piece. Even if they charge you double, if the installer takes ownership, it's worth it. If they say you, because they are your parts, then probably should ask the last time they did one.
Another option is to find body shops that do truck work, rubber gaskets lasted much longer in trucks. You could also call Hagerty, etc, and see if they have some preferred installers
