Since I have been asked how I make it look so easy (time lapse pictures at fault) I decided to post my little helpers.
First you need some sandpaper. You will want something that is for wet sanding with a grit of 1000 up 3000. I prefer to use 2000. Yes, the 1000 will work faster but take more polishing effort. 3000 will need much less polishing but take much longer to sand flat.
Once everything is flat it is time to polish things up to a shine. Here are my favorite compounds and polishing foam pad.
It also doesn’t hurt to watch a few youtube videos to get an idea of the different ways of polishing. Basically they are all similar but some people have different techniques. Hope this helps.