Is it really that simple? It can't be, can it? I mean, I get that there is likely a lot of skill to get a good quality brushed look that will match or at least not clash with the side panels, but this seams overly simplistic. I wonder what it would cost to strip it down myself and then just have someone finish it.
Yep - go for it!
Have confidence in yourself!
Do your homework (as in read up some more, talk to people who've done it, etc) ... then set aside reasonable time to deal with it as a project. Prep an area, tools, brushes, etc. It's mainly a mechanical process (so no creativity challenges) which means you won't have to do anything different as to what professionals have to. You'll most likely find that problems
were imaginary, and might surprise yourself positively with the swirl/brush pattern you created to give your bike the personal touch. It's much easier to create uniformly looking grain along the whole tank surface (eg: long continual sanding strokes front to back) than symmetrical or balanced looking round swirls freehand, though crazy-pattern-swirls can look good too. At one time some posh Shops in Melbourne decided that Polished/Grained Stainless Steel shopfronts were in vogue, I routinely made those from s/s sheet metal, using a die-grinder with a sanding-flap-wheel to get the grain
just right (to please the designer/architect). It's not hard .... just need to take time and remember: No rushing the artist !
It shouldn't be too hard for you to find a car/bike paint (accident repair) shop where they clear-coat your fully prepped tank at very reasonable cost.
(P.S: not completely visible in the photo, all panels were polished to display vertical grain, including the welded corners where the sheet metal was folded around timber backing - which in turn bolted through the wall to form a skin on the shopfront)