Selective polish with a green polishing pin from Rio Grande works well for me. Takes very little effort and you have very good control. I put the pin holder into the end of a wood dowel and use the pin like a pencil eraser.
I tend to mix and match...doing what seems fun at the time. I usually draw borders then scroll patterns and scenes. Then cut borders including any gold cavities. Then cut the scroll and any animals. I will add gold lines about this time as I like to see what it will look like with the rest of...
Keep in mind that you should keep your tool holding hand/wrist ridged otherwise if you rotate the vise and at the same time make turning movements with your wrist you WILL induce elbows. It is near impossible to combine the two movements uniformly. I catch myself doing this from time to time...
I have engraved a good bit of aluminum and find Never-Seez or some other anti-seize lube works really well. Aluminum galls very easily and sticks to the face of the graver causing a false face making it hard to cut a straight line. I strop the point on hardwood frequently as well as lube...
Pap...I use square carbide for almost all of my cutting. HHS flats made from #1 knife gravers for gold line cavities...and scrapers for sculpting. Gravers have 57 degree faces and about 10 or so degrees lift with very small heel.