anyone can learn to groom...itll take practice, and the first couple of times you may butcher the cut...
also remember it depends on what kind of dog your grooming and the cut your keeping it in...
id never suggest a novice start grooming poodles for example...
a yorki typically has 3 cuts.
1: show cut, that long insane silky meticulous flowing coat and top knot. this is the absolute hardest to acheive as it requires mostly scisoring and scisoring is a hard skill to master.
2: medium or puppy cut...this ones the common groomer clip, guard goes on the razor to the leanth your prefer and shave away...almost anyone can learn to do a puppy/kennel clip all you need is a GOOD pair of clippers.
3: SHORT. i rarely see yorkies in a very close cut unless they are having skin issues...gettign close to the skin is not as easy as it looks...
now in terms of doing it yourself, a dvd is a great start...id also have your friend who has yories show you how she does it...BUT in the end youll only learn if you get your hands right in there.
things you will need:
a GOOD set of clippers/grooming sheers, dont ever buy the ones in the likes of grocery stores or walmart, they get too hot and the blades dull too quickly, dull blades leads to a bad cut, pulling and potential for nicking.
personally i have the whal arco and love it, its wireless so i always have 1 battery on use and one charged on stand by, i like it because its relitivly small, easy to use, and light!
i use that for pony clipping my 10lbs powderpuff chinese crested and tidying my 5lb hairless chinese crested.
whal also make the arco mini which is great for finnish work and very small toy breeds, im planning on purchasing the mini once ive got the spare cash to use as a paw and face trimmer.
if not il pick up an oster finnisher...which is another small clipper prefect for sani trims, paws and faces.
be prepared, you WILL spend money for a good set of clippers, but they are less likely to burn out, burn you, burn the dog (the motor gets incredibly hot on the ones you can buy from the store) even the ones with "good brand labels")
belive me, its an investment, but if your serious about grooming your own dog, its worth the money!
2: invest in 1 REALY good pair of scissors...you can get them from grooming supply places or human hair supply places, but you want a GOOD pair of scissors, and keep them well looked after.
3: buy a can of clipper cool and one of clipper cleaner...cleaning your clippers will keep them working well longer.
4: buy spare blades for your clipper...nothings worst than being 1/2 way through and your blade going dull lol.
5: invest in a grooming table or pad...i personally bought a noose and none skid mat and i use my coffee table...
i will be honest and say my back does start to ache before im done with both the dogs, and once i get my own place ill be investing in a grooming table...your back will thank you.
and a good little shop vac. you dont want to eb using your main household vacume for picking up all those hairs, they will clog everything...a shop vac will handle it all and never complain.
other than that, watch, and then get your hands in there.
the biggest issues come if you have a dog who doesnt like being groomed, it can be frustrating when your trying to learn and there wiggling all over the place.
so lots of high value treats and start small