My best advice: follow the pattern directions to the "T".
Some patterns vary.
Some ask you to seam the shoulders and sides of the sweater...then seam the sleeve into the "hole". (My least favorite method)
Some ask you to seam the shoulders, then seam the sleeve onto the armhole edges...then seam up the side /turn the corner/and seam down the sleeve...in one continuous seaming. (My favorite method)
I never knit sleeves "in the round" on my own initiative just to avoid sleeve seaming.
But, ContiKnitter here at KH is brilliant at improvising his way around seaming anything by knitting in the round.
Ask him for his advice on that matter.
I am usually just a follower. I follow the pattern directions for the most part...and things turn out good.