10k loan with 700 credit score and 4k down possible? ELI5

I don’t know what steps I need to take— I’m good at making money but pretty financially illiterate as I come from a poor background. I’m finally at the point where I’m confident I could pay a small loan like this off easily in a short period of time—probably just a few months (especially because I have items of value to sell, including my current truck and van too if needed). And a more reliable vehicle would help me make more money with less stress (current truck is always breaking down). I’ve never taken out a loan so I’m not sure how it all works. I’m assuming I should go through a credit union. Thanks for any input

It is a private seller, the vehicle is in excellent condition and at an excellent price (but not too good to be true)