This is so American...
Mandolines, Spiralizers...
Honestly, Who really needs this stuff?
Spiralizer... ok, it's super useful for zuchini spaghetti but... who realy needs zuchini spaghetti every day?
It's the kind of expensive appliance or KA mixer attachment that people will probably use once or twice (ok, everyday during a week) and then forget it in a pile in the garage for 10 years and will end up in a thrift store.
Mandolines are useful, but again, who need milimetrically accurate sheets for home use?
Eventually, to cook "cuisine", it is super handy, but who cooks cuisine every day?
What can't miss in a good kitchen is at least one excellent professional chef knife, always extremely sharp to be safe (dull knifes are very dangerous). a good knife can do everything a food processor + grater + mandoline can do.
A mandoline is very useful for fancy people like Bree Van der Camp that cooks 3 cuisine meals per day.
Appnut, you say you're coordination-challenged.
The best thing you can do is buy a big jar of plumbers patty or play-doh get an extremely sharp knife and practice cutting skills. The good about using plumber patty is that you can spend hours and hours practicing without wasting any food.
When your skills improve, then you can start with potatoes (to improve different cuts)
I can guarantee in 2 weels you'll be slicing as accurate and fast as a food processor or mandoline and in 6 months you'll have "optional blades" built in your brain to cut julienne, dice, shred and even make ground beef.
The only secret is practice, practice, practice.
And of course, posture, a safe and sturdy cutting board (if it's slippery and "dancing" on the board, put a wet cloth under it.) The board can't move a single millimeter while cutting.
And also, when you have advanced knife skills and the knife sounds like a machine gun hitting the cutting board, it looks fancy and impressive.