I've been at my current job as a software developer for nearly two years (22.5 months, to be exact). I'm due an appraisal every year, so my next one should be in July, when I reach my two year anniversary with the company.
The appraisal is usually very informal. Last year it consisted of a short discussion, followed by a salary renegotiation. It's informal enough that there's no set date for it, I was just called into the conference room one day out of the blue.
I'd really like it to be moved sooner, as there are some things I wish to discuss and renegotiate. The main issue I want to discuss is flexible work hours, which is something I really want. I asked for it in my last appraisal and was given it informally by one manager, but then subsequently denied it by a different manager. I feel that I've become more integral to the company in the last year, building some important products and taking on new responsibilities, so I think I'm in a better position to negotiate full flexible working
I'm not great with this sort of thing; I worry that by asking I'll come across as confrontational. It's a small company, so I still have to sit across the room from my bosses if they say no!
What strategies would the Stack Exchange community recommend?