If you want experience installing mods manually Starfield is about as easy as it gets and is a good way to learn. Create a starfieldcustom.ini file and drop mods into your My Games/Starfield folder. Most mod pages include the exact instructions.

for the mods that are out its just easy to install myself. I really dont like the mod managers and prefer to handle it myself. Although it does get unruly with bigger mods and dependancies