Welcome to the Beta club. I'm a newbie too but have eight painful, bruised, red, blotchy round discs to prove my allegiance. I'm probably not the best advocate for the drug since I'm having a rough time of it; but I'm going to stick with it.
My experience so far has been;
Took the full dose straight away- just to see how bad it could get- and never took less than full.
Some days are better than others.
Belly shot gives less flu but quicker to take hold.
Legs are painful to the extreme for a week or more after shot.
Buttocks are less painful but the flu hits me harder a lot later after taking it.
The day after is usually worse than the flu episode. It's like hangover plus one.
It's either a shot day (woohoo! look forward to that-not) or a recovery day. Neither are that great.
I'm having trouble fitting my life around treatment and recovery. Work is on hold.
Some days I think it's worse than the disease itself and I've taken so much on faith and 'research' that maybe I should take the natural no treatment road like others and be free...
I have had the most awful cold to contend with as well this last week and a half which really hasn't helped.

Keep us up to date with your progress. Would be interested to hear how you (or anyone else) is getting on.