Rotate your iPhone so the right edge faces you.

Open your iPhone by swinging the screen up from the right side, like the front cover of a book.

Lean the screen against something to keep it propped up while you're working on the phone.

If you don't have anything at hand to lean the screen against, your suction handle can do the trick.

During reassembly, lay the screen in position, align the clips along the top edge, and carefully press the top edge into place before snapping the rest of the screen down. If it doesn't click easily into place, check the condition of the clips around the perimeter of the screen and make sure they aren't bent.