Detailed instructions for installing LineageOS on the FP3 are here.
If you don’t feel confident, check to see if there’s a Fairphone Angel near you who might be able to assist.
Good luck! 
Detailed instructions for installing LineageOS on the FP3 are here.
If you don’t feel confident, check to see if there’s a Fairphone Angel near you who might be able to assist.
Good luck!