I usually write in first person, present tense or third person, past tense. I don't mix and match, and I've never thrown both in in one story for fear that it will get annoying, but now I'm writing something where I feel if I stay with one viewpoint, and one tense (first and present), I will want to bang my head against a wall.
As a reader, how much would a switch of tenses along with viewpoints and person bother you?
