newbie grafting questions.

I had no experience grafting until this spring when I started grafting pear prunings onto callery pears scattered over my property.  Results were good but pears are supposed to be easy.
Around 7/5 I purchased 3 persimmon and 1 pawpaw scions, they got lost in the mail until 7/17, my hope for success dropped from the already low point.  On 7/18 I grafted these, three from each scion.  When I purchased these I considered them mostly as entertainment (don't laugh, cost less than a couple going to the theater, and more fun) and hoped that I would get a couple to take.  The persimmons were grafted to DV saplings along the edge of a field and the pawpaws were from MO Dept of Conservation saplings I purchased two years ago.  Well, quite unexpectedly  all 12 have taken, now I have questions.
How long should I leave the electrical tape on the graft?
Should I stake or in some way support the graft/scion?
Since the persimmons are not really where I want them can I transplant them in late fall after leaves have fallen or would early spring be better?  I have read that persimmons can be difficult to transplant, is this true?    I can cut some surrounding trees to open it up for more sun and leave them where they are but I did three groups of three and within the  groups they are very close to each other (didn't think more than one in three  would take) and would prefer to have them where I can care for them more conveniently.

you shouldn’t need to stake them. if you feel like you need to move the persimmons, wait until fully dormant, and try to make sure that you’ve got all the roots!

That's so exciting, I'm so happy for you Nick!
I can't give good advice on moving your trees as it will depend on your climate and the size of the tree. Generally 'when dormant' is the advice - I've been told in autumn too so that the roots have a chance to grow underground over winter. I tend to move/plant in spring, since my climate is wet and windy, so the roots are not likely to get much growing done in the soggy soil over winter.

When the graft has taken the two sides graft and scion will knit together so shouldn't need the tape any more. In my experience the graft wood sometimes grows on it's own and hasn't actually melded so it isn't worth removing prematurely. Obviously if the wood is swelling around it then remove it, but it may be left until autumn again.

thanks for the help and words of encouragement.
I think I will try to transplant one of each variety the winter and slash back some brush/trim trees away from the others.