I am a newbie maker, so I don't have those fancy leather belts!!
Leather is the way to go for stropping, but I don't know how necessary power stropping is to do. To get the ultimate edge I would like to get a stiff felt wheel and dress it with compound. I hear that they are awesome. I'd still like to strop by hand after any wheel though.
Yes, I do just do it by eye. You can get a pretty even angle by eye, and when you slack belt grind the edge the belt does most of the angle guess work. I was petrified to start sharpening using my grinder, but it is easy to learn how to do, and you get AWESOME results. ANY belt sander will work too. You can get a cheap 1x30 to do the job.
I hope other makers chime in for you, but I bet no one else has because the way i have described is pretty much a standard way of doing things. Sharpen on the sander, and buff/strop.
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"Come What May..."