Everybody has a sewing bug-a-boo; something they dread doing in sewing or in the process of sewing. I collect these, so post yours if you care to.
My least liked task is cutting and marking, particularly dressweight fabrics cut on the bias. I know this can be managed with a lot of weights but that doesn’t keep me from wishing I had a vacuum table. I can say (emphatically) that sewing bias seams is easier if the cutting is precise.
While I’m thinking of it -fyi- bias does not need a french seam because it won’t ravel. Only silk cut on the straight of grain needs an enclosed seam.