Below, I do the same with his rear hooves.
I pick up his hoof, then
rest it on my leg,
as shown in the righthand picture.
Shown below is our farrier, Tracey, trimming
the hooves of our 16 month
old filly,
Rosa,
and our "20 something" Appaloosa mare, Aspen.

First, Tracey clipped a little of
each hoove off with
a special tool and then she used a BIG file
(similar to
what we use on our fingernails)
to even off the hoof all around the bottom of it.
(Don't worry, just like we clip our toenails,
the horse can't feel the trim.)
Here's Magnum, our Quarter horse gelding,
getting his trim from
Tracey.
Our horses go barefoot most of the year unless we ride
alot on
pavement or rocky
areas where they'll need more traction & support.
Like most horses, our's our
trimmed or shod every 6 to 8 weeks.