For the trim there is a tool to remove it (it just pops out). Then remove all of the trim clips. Next, there is a tool to cut the sealant behind the glass. I'm not sure what it called but it has a blade which has a wire that connects to a handle so you can pull it. Remove the glass then remove all of the old sealer with a blade. Re install all of the trim clips and the spacers that go at the bottom (to keep the glass from sliding down) Lay a bead of silicone (black) 1/2" diameter all of the way around the windshield frame on the car. Carefully and slowly put the new glass on the car. Start be resting the bottom of the windshied on the spacers, then tilt the top in slowly making sure it is lined up left to right. Apply pressure around the windshied to make sure it contacts the silicone evenly all of the way around. I'd probably wait till the next day to reinstall the trim (it just clips on)
Btw, I am not a glass guy. I just had a guy come out and replace mine and I watched him do it. It is not that complicated, but it is a pita to cut out the old windshield
Hope this helps! Hopefully someone will chime in and let you know the name of the tool you need to cut the old bead. Also maybe they can add some tips to make it easier for you