Right on dude,
I'll be in a similar situation next season in Peru. I'm essentially living there for the season & getting an apartment in Huaraz... but I'll be alone. I totally hear on wanting a guide... if only for the company. MichaelJ really knows his shit, and your post was a little confusing, so don't mind the "attitude" too much and don't hesitate to ask for his or any other grumbly regular's advice.
Pisco is also on my list to get a taste of altitude etc. Honestly though there's really no need for a guide, lot's of people for company, and lot's of guides to simply "follow". Although if you got edema or something... (they'd take care of you regardless I'm sure, but that'd be pretty poor form).
Anyway I'd be curious about your experience, GOOD LUCK! Be safe and take lot's of pics. Gotta love spontaneous trips to the Andes!!!