First, your lucky that the junkyard you go to is letting you remove the windshield yourself. Mine wouldn't because they know most people will break them in trying to do so. But they removed 2 ( 1 for my Dakota also ) for $70 each.
I also intended to try replacing these myself - think i even started a thread - and received the same feedback you are getting. I went so far as to buy all the stuff I thought I would need.
This is the YT video which shows what steps you should take.
It is also the video that made me change my mind.
I found a reputable shop that would install used windshields ( as opposed to me buying 2 new ones from them ). They charged me $150 each.
Could I have done this myself ? Probably. Would I have it not leak after the urethane cured ? Who knows. But with my luck it likely would have leaked. Then I would either have to do it again - gaining that much more experience - or take it to the shop to fix my screw-up.
Good luck