The Weasch brand keeps things simple, and you won't need special tools to use them.
Fuse Relay Switch Kit, 12V 30A, 4 Pin SPST, 30A Switch Harness Set, Automotive E
You will find that Weasch relays fit well in many projects, and they feel sturdy and dependable.
A nice touch is the clear labeling on the Weasch relay, which makes setup less confusing.