rookie need advice swapping 7.25 for 8.75 posi

Bearing questions and adjustments: I need to know the basics (thanks for your help!)

1) I have a-body housing which I removed old axles with roller bearings and purchased new ones with green bearings installed. Can I install these myself? Do I remove the end-play adjustment collar or how do I adjust end-play?

2) I bought a 3.91 sure grip pumpkin (PS - what can I spray on it to clean up the gears?). Do I need to remove the axle buttons? How?

3) Do I need replace the seals inside the housing? Can I do it myself or take to machine shop? They look and feel ok but I dunno...

4) Any critical adjustments I need to be aware of?
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