
Hi Suzanne,
We have a Bichon too, who is now 19 months old :-) Groomers won't usually cut their hair at all under 6 months old because it can spoil the coat if it is done too early apparently. They will do just their face and feet if they are a bit overgrown. Benji has been going to the groomers ever 10-12 weeks since he was 6 months old and comes out looking white and fluffy :-)
I bought some clippers to have a go myself a couple of months back but I find it rather hard to do, although I haven't got a grooming table and he moves just at the wrong moment. Can't you find a picture in a Bichon book and show the groomer how you would like it done.