Hey Jason,
there is a lot of info on your topic in this forum. Please use the search function.
It is not really difficult if you know how to read the VFD documentation and to follow the instructions. Note that cheap chinese spindles have a lousy manual in bad english that often teaches you nothing. An example for a good VFD manual is the Omron MX2 Users Manual.
But you got to know that a VFD is a device that is intended to be built into a electrical control cabinet, and assembling a VFD, a spindle and a CNC machine means building a machine and in this case you should follow all the safety regulations. You should not wire it yourself without an electrician. However, you can get ready-to-use systems from spindel-shop.de.
Regarding VFD choice, I would pay attention to buy a VFD that can do Sensorless Vector Control (so avoid Huanyang HY Series and other noname crap) and ModBus override.
Also I would never buy a VFD that willingly omit the VFD input current rating on their nameplate to fool you.
Also be aware that on cheap chinese spindles, their power rating is often wrong.
If you are in North America you usually find split-phase electricity which means, 240 V is already there. You just need an electrician to install a MCCB and a NEMA 14 socket so you don’t need to use 110 V.
Welcome to the forum!