Are you sending those back because you will never have the ability to use them or just because you can't right now and don't have the time to practice? I suspect that most of these things take some amount of practice, especially if you don't start young.

Then again, I haven't touched my knitting needles in several years. While I wasn't that great with them, I was willing to practice if only I had something worth making but I didn't really have any ideas.