Cube 3D printer community

I'm not sure I can do a full tutorial.
However, I can run through what I had to do to get my printer to this state.

First things first. Remove the screws from underneath. Four short ones hold the top case, and three longer ones at the back hold the vertical steel frame.
Gently lay it out on the bench, and separate the top cover by disconnecting the ribbon cable attached to the main board.

Then pull the four plugs from the front of the motherboard, and unscrew the main board from the bottom case, including the earth wires screwed to the main board near the power socket.

The last picture shows the printer standing up (if you do this, fit the center screw at the back to hold the steel frame upright, and tie the z axis to the top of the x axis) with the main board removed.

That's the easy bit.

Next comes the fitting of the replacement RAMPS board, and wiring it all up...