Ha, you don't want to know!
Seriously though, my hypomania usually ramps up into full-blown mania scarily quickly (i.e. it usually only takes 7-9 days without a meds change), but this is how my highs usually start off:
-Start getting super productive and raring to go e.g. getting through mountains of work, and have landed jobs unusually quickly in this state (only to be too manic/depressed to work them later!)
-My introverted and reserved personality becomes chatty, 'fun' and really social. I've actually got compliments about how I've changed for the better from people who weren't close to me.
-Want to party and this coincides with some pretty obvious hypersexuality
-Irritability creeps in and I can start to appear arrogant and abrasive
Then what usually happens is I get less and less sleep, until I'm down to nothing, and psychosis enters the picture. (Luckily this hasn't happened for over 4 years though, since I now get myself to a pdoc at the first sign of a high).