Like doors, windows are made up of frames or hangers and windows. The frame is fixed or dead inside the wall. In the meantime, hire the windows installer if installing windows is too time-consuming for you.
Measure the width and height of the window sills.
Measure the width and height of the window leaves.
Crab and cut window leaves (when too wide and too high).
Insert/attach the window leaves on the sill, steel to fit with a tolerance of 3 – 5 mm, either toward the width or towards the height.
Remove the window shutter, attach / close the hinge of the window leaves to the window pole (the thick side) with the distance from the lower side 15-20 cm from the edge (for horizontal rotation) or the hinge is planted on the threshold of the shutter blade at 15-20 cm from the edges (for vertical rotation).
Insert/re-attach the window leaves on the sill, stuck to a good position, then mark the pillar/threshold of the hinged window corresponding to the hinge on the shutter blade.
Unplug the hinges on the shutter blade by removing the pen, then placing it on the pole/threshold of the sill.
Replace the leaves of the window on the frame by pairing the hinges, then insert the pen until it fits, so that the windows are attached to the window frames.
Try the window leaves by opening and closing.
If it is still considered fitting, release the shutter blade by removing the pen.
Stel again until the window leaves can open and close properly, flat and straight with the frames.