I followed this guide to replace my keyboard. I removed the backlight from the old keyboard, installed the new keyboard, then replaced the old backlight - it was my keyboard that had failed after liquid ingress, not the backlight.

I confirm that Kamiiyu is correct and I skipped 11-14 & 44-53.

Should also add that on my machine, Step 42, the orange screw was the same as the reds, 3mm. The far left red one was much longer. The bottom red screw had a wider head than the other three.

So just follow it carefully, take notes and take your time.

Thank you iFixit. I now have a fully functional Late 2008 MacBook that Apple deemed "vintage" and beyond repair - all for the price of a replacement keyboard (£15 from ServiceX Ltd in UK who also supported me) and about four hours work! Happy Bunny.