Yes, they do get easier. Especially if you leave enough that is not sewn. I always leave as much as I can. It's also helpful to not press the other seams until you stitch the partial seam, then press them all.
I do a lot of improvisational piecing and have found partial seams to be very helpful, esp. when piecing together multiple size units. Keep at it. Being able to do them will open up a lot of possibilities for your work.
Rob