I ordered on of thoes booklets, and i'm still not sure as to what i should be doing
may be it's just me.
I know it's tricky learning what is really an art from a booklet - maybe you could get along to a show or two and study how the dogs are presented (that's how I learned to begin with)? You'll find that there are different "styles" for want of a better word - not everyone trims their dog in exactly the same way (some leave more hair on than others, for example). Pups are also not expected to look like perfectly trimmed mini adults so you don't have to worry about that

All puppy coats are different and some coats will take a lot longer to be stripped out than others - it's not unusual to see pups at shows with fluffy sides and hairier legs than adults

You'd start by doing the head, neck and along the back (or as much as is ready to come out) and then work on the sides later as the hair gets looser (and yes you would eventually aim to strip down to the feathering line just level with the elbow). It's a slow process but well worth it for the end result
