I don't know how much research you've done, but have you checked out all your options? You mentioned that you wanted a worsted weight superwash merino... what color did you have in mind? And what is the name of the yarn you're considering? The reason I ask is because I know that they are lots of folks here at KH who would be able to give great suggestions for other yarns that would be good candidates for your sweater, or tell you where to shop to get the best price on the yarn you're considering now.
There is no right way to knit; there is no wrong way to knit. So if anybody kindly tells you that what you are doing is "wrong," don't take umbrage; they mean well. Smile submissively, and listen, keeping your disagreement on an entirely mental level. They may be right, in this particular case, and even if not, they may drop off pieces of information which will come in very handy if you file them away carefully in your brain for future reference.