In reply to dougair: I was in Huaraz in 2006 and I climbed Pisco witrh a guide. My only previous experience was trekking up the Monc and Jungfrau with a bunch of highly experiencded army guys and until then I'd never been to altitude or worn crampons so I was thrown in the deep end.
In Huaraz there were plenty of guides around but it's best to get a reccommendation from the Case de Guias there first as opposed to going straight to the many tour operator shops. Also, the guy who owns cafe Andino is probably a good source of info.
I hired all the gear through my guide's shop and transport was included. From what I rememeber we took a packed minibus for quite a while to a small market town then a taxi to the trailhead in Huascaran national park ($20 for 3 day permit back then) where I paid a small amount to hire a mule to take my pack as I'd been in bed all week with food posioning and feeling worse for wear and hadn't had a chance to do any altutude trekking to acclimatise. We had a 3km hike up a fairly steep windy trail and camped on the plateau below the mountain hut at 4600m and set off at 1:30am to head to the summit and got back just after lunch and we camped a second night near the hut. From the camping area there's a long walk over a morraine of big rocks which is a bit tricky in the dark!
I'd call myself a novice and apart from the altitude being tough due to not being well enough to properly acclimatise I was fine. Just felt tired.
The view from the top was beautiful and there's also a really pretty lake on the drive in and out that's worth stopping for a bite to eat (I was served guineapig from a pot but had no idea what it was until I'd eaten it!)
I know the info is a few years ols but hopefully it helps. In Huaraz there's a lovely climbers hostel called Churrup
http://www.churup.com which has dorm rooms (roughly £6 now) or private rooms although it didn't have the most reliable hot shower in the dorms! There's a restaurant on the top floor with a lovely panoramic window view of the mountains and a fire and books to read. The old man who owned the place with his grandkids (if he's still alive) looked after me when I had the food illness!
Enjoy!
Amanda