I went on a bud grafting workshop the other week. In short Cut a bit, slice a bit, line up the green bits, wrap it to fuck with stretchy magic tape. Hope for the best.
(Edit: clearly not an expert here and my fullwrap pic is out of focus, but does capture the albion bag nicely ).
Anyone done much grafting fruit trees (or any trees for that matter) onto rootstock? I'm thinking @mespilus or @edmundro may have some experience.