The HF 1x30 is a fine machine that has worked well for me. I have many belts but have settled in with this sequence for sharpening: 320 or 400 then I go to 600 or 800 then I use a Surgi Sharp leather belt with the white compound that came with it. This gives me shaving sharp edges that I am very happy with. For touch ups it depends on the steel and condition of the edge. I may try to raise a tiny burr with a few passes on the 6 or 8 hundred belt then strop. I have belts up to 3000 that I never use because I prefer the toothier edge I get from stropping after 600 or 800.
To help keep my angle consistent I cut out two 2.5" triangles from a cereal box and marked the angle on them. One at 20 degrees and one at 25 degrees.
With the sander off you can hold the blade up to the belt with your angle to get a mental image of where you should be. Then do a few dry passes until you are comfortable.
Once you sharpen a small pile of knives you wont need them any more.
I hope this helps.