Installing hidden hinges can be quite easy. It can actually be
easier than using standard revealed hinges.
Here are the steps to easy installation:
Assuming your 35mm hinge holes were all drilled the same
distance from the top and bottom of each door, mount the hinges to one
of the doors.
Install a hinge plate into the top hinge. Measure
from the top of the hinge plate to the top of the door (X
in the illustration below).
Place a mark on the stile of each cabinet opening on the
side where the hinges will mount the same distance as
minus the distance the door will overlay the rail at the top of the
opening. The illustration uses a 1/2" overlay (typical overlay
for most doors). Adjust for your overlay if different. (Formula
for stile mark:
minus overlay = mark from top of cabinet opening)
Mount a hinge plate at the top of each opening on the hinge
Now install just the hinges on the rest of your doors.
Mount a hinge plate on the bottom hinge of each door.
Slip the top hinge into a plate that has been mounted on
the cabinet and tighten the mounting screw. Then screw the
already door-mounted bottom plate to the cabinet. Repeat with
the rest of your doors and make any adjustments to the plate as
indicated in the instructions included with your hinges.