The iPhones 12 and 12 Pro both earn a 6 out of 10 on our repairability scale (10 is the easiest to repair):

Display and battery replacements remain a priority in the new iPhones' design.

Most other important components are modular and easy to access or replace.

Liberal use of screws is preferable to glue—but you'll have to keep them all organized, and bring out your special drivers (pentalobe, tri-point, and standoff) in addition to the standard Phillips.

Increased waterproofing measures complicate some repairs, but make difficult water damage repairs less likely.

Glass on front and back doubles the likelihood of drop damage—and if the back glass breaks, you'll be removing every component and replacing the entire chassis.