which shift kit?
Oh you def have to remove the vb; no biggie there. And splitting the vb isn't too bad; just take it apart filter side up. There's one screw that has to come out from the other side; so do it first. I'd say adjusting the new manual valve is the trickiest part; but just follow the instructions, and keep going back over them. And do this on a large enough work surface that has an edge to catch rolling parts... But they don't tell you "everything" so check in here if you have questions.