Not bad, sort the hands out as well - or just practicing on the 6139?!
If you are confident working on other movements then I dont see why the 6139 will give you any bother...it's just a bit more involved. Use the tech guides, the A is a bit more useful than the B guide, so do get both even though I guess that is a B. Also check out Mikes (PollyC's) excellent guide....anyone with a link?!
Good luck and enjoy !