
Tried and failed several times now - I have absurdly bad luck medically with my dogs! Lifetime injury to a shoulder, slipped disc, that sort of thing. And the disc dog would have been a serious competitor.
Of the dogs I've tried it with, I find that they do pick it up quickly with a good trainer - but those are not always easy to find. Many are too focused on competing instead of having fun.
Weave poles - don't be nervous! Various ways to train them and one of the most effective is 2x2, which you can find on youtube. Easy, you can build a home pole kit to practice with, and effective.
The first dog I tried it with (shoulder dog) was my first dobe, and it did take a while for him to get into the swing of it but it wasn't the learning itself - it was the distraction. Many agility places are set up in distracting areas like fields where other dogs walk, or equestrian buildings where the smell of horse poo (or indeed poo that's been missed) are intensely tempting for some dogs. The poo was his big downfall but in the end he was getting really good, until he whacked his shoulder. Poor help from the vets at the time meant he never recovered from it.
A tip - get your basic obedience sorted first. You want an excellent recall (tempting smells, other dogs, some of whom may not be sociable) and a decent 'wait' at a minimum. A cue to slow the dog down can be very useful too sometimes!