Before I answer this question, a couple of disclaimers: 1. I'm going to assume I randomly woke up with my normal body parts swapped. 2. There is just noodles and no sauce. If you didn't mean this, then assume I washed the sauce off lol. 3. The noodles are at a set length (unlike hair). Even if cut off, if they grow back, they go back to the original length only. 4. The spaghetti is already cooked. Okay, so in order to answer this honestly I have to know 2 things: "if I were to cut the spaghetti off, would it grow back?" and "how long is the noodle?" We'll need to know the answer to the more important question first: how long is it?

If the noodle is riddiculously large (>20ft) then legs. I could loom around like an eldritch monster and it would be sick af. I would start a new religion.

If decently shorter than that (2ft - 15ft), then the next question applies: how will the spaghetti behave if cut off.

If it doesn't grow back: Then feet. I could live easily without my feet, but hands might be a problem. I would simply cut it to a manageable length.

If it grows back slowly (slower than 1m/24 hours): then hands. It's basically a free food source with minimum problems. I wouldn't feel comfortable eating my feet since I have no idea where they have been, but hands? Easy. I would donate the excess.

If it grows back faster than the listed time, then feet. At that point, it's not worth cutting off at all. Maybe I'll cut it off before going to bed and trim it in the mornings for extra carbs, but that's about it.

If pretty short, but not tiny (1ft - 2ft), then feet. I would just buy larger shoes and compression socks. I would be annoyed by this, but wouldn't see it as a huge hinderance. Maybe I would wrap the noodles around a rod or something to keep the shape.

If very small (<1ft), then hands. I'm on my feet a lot and have to walk a decent amount during the day and I don't know if these tiny noodles would help carry my body weight without pain. After maybe 3 hours of standing, it would become unbearable, since my muscles just aren't used to carrying so much weight in very little surface area.