The standard iPhone 17 has separate battery, screen and back-glass repair guides. Its screen procedure warns that the battery cannot be disconnected before the display comes off.
What to check before buying
Screen work
The iPhone 17 screen guide says the battery cannot be disconnected before screen removal. That makes the opening stage distinct from a phone whose battery connector is accessible first. The guide covers the standard iPhone 17; Pro and Air models have separate internals.
Battery and rear glass
The rear-glass guide calls for new adhesive and calibration with Repair Assistant after replacement. Battery replacement has its own procedure. These details apply to the standard iPhone 17, not the Pro or Air.