I highly recommend making a rotisserie for this project, especially for a wide body playfield. There are several threads here on pinside to help you. Even though this may be your only swap ever, having a rotisserie will cut your work by half.

Mirco playfields are very good so very little drilling is needed, but occasionally there may be a hole or dimple that doesn’t line up quite right. DO NOT predrill all the holes and dimples before test fitting the pieces. You will find many mechs under the playfield will not align exactly and you may have to make adjustments to the holes or dimples to make them fit correctly.

Lastly, this is a great time to clean and polish everything. I use a variety of cleaning products and polishing compounds but there are a few that will get you the best results. My go to for cleaning everything is Simple Green. It is cheap and works great. For getting rid of rust and corrosion I use Evaporust. All my metal pieces including screws, nuts, etc go into a bowl of this stuff. It will make old rusty or corroded parts look new again. And for polishing I use Flitz. This is amazing stuff for bringing out the shine on metal parts. I take all my stand up posts, wire forms, screw heads, and other metal parts that show on the top of the playfield, and polish them. All the metal posts I put in a drill and run it through a rag with a dab of Flitz. In a matter of seconds, you will have a super polished metal posts or screw heads that will look better than new.

Not necessary. You will most likely leave the original in the machine and the rotisserie with the new playfield right next to it. Transfer from one to the other that way.