I have just finish mine. I was scared by the mushroom type welded pins and the number of they.
First I get my welder and lightly touch the upper part of them til they dissolve, one by one til I can get the metal plate and the keyboard off.
To install just reverse order, press with your thumb next to every pin and when it pass through, just weld again, wait to solidify and there you go.
One more thing. Since i replace the keyboard with the back lit version and my motherboard does not have the four pin connector, is it possible to install the connector and get the keyboard lit?