As far as plant pruning much depends on what you would like to achieve from your plant. If your primary concern is
flower production ~NOW~ yon can wait to prune until after the plant has ceased flowering.

However, if plant health, well growth, attractiveness, and a more spectacular show of flowers happens to be your focus
you could jump start pruning once the growth commences.

Frank,

depends on the variety. I have a Brunsfelsia magnifica, and mine blooms like crazy 3 or 4 times per year at least. It is starting to bud up now. I usually cut it back hard right after this first bloom cycle with good results.

Good luck!

Boca Joe