There is actually VERY little seaming. The body portion, of course because it's a cardigan so open in the front, is knit back and forth from the bottom up until you get to the armpit level. Then that is put aside (left on needles) and you knit both sleeves, also up to armpit level, then join all 3 pieces together and the rest is worked as one piece. The only seaming is under the arms, and it's only 12 sts worth each arm. VERY do-able! It has a lot of other finishing requiring picking up of stitches around the neck edge and the side fronts.
The pattern was fairly easy to follow although I found a flew glitches in it I worked my way through and it came out fine in the end. The pattern was unclear in a few spots and there is definitely a mistake in the stitch count at the end of the sleeve decreases, at least on the size medium. I figured out a way around that too!
So as a first sweater project? Sure, why not!! You don't know until you've tried and you'd probably discover it's not as bad as you think it might be! It IS a lot of work though, but hopefully worth it in the end.