Teaching a boy how to wipe is own bum??????

[Lanita]

Hi there,
I was wondering if there are any Mums who could give me some advise on how to teach my son to wipe his own bum after a poo??
He just seems to be getting it all over the place & I end up taking over before he uses the whole toilet roll.
He is 4 & generally potty trained, but I think it's time for this step before he starts school. He does use a potty which is quite big & like a little armchair, instead of the toilet. Should I try him on the toilet instead??? Should I get him to hold the dangly bits while he wipes, so doesn't get them covered in ...? Should he sit or stand??
I think I'm realising the answer to my own question as I'm writing, but if there is any advise, please send it my way.
Thanks!

[tryingtobemarypoppins2]

No idea but would love to know too! DS is 3:6years.