What I've 'gotten' from most folks here is that patterns include one stitch on each side of a flat piece for seaming.
So you'd need to subtract those stitches (from each place, 6 total for 2 front pieces & 1 back piece) for the fit to be the same as the pattern.
Depending on the size needles & yarn, that could make quite a difference...say if you were getting 3 sts to an inch, you'd have 2 extra inches in the garment.
Good Luck! Go for it, I *hate* seaming!
P.S. I just read your post again, and I'm not sure if the front is knitted in one piece...if it *is*, you'd only take 4
stitches from the total.