Take covers off and give it a good clean, can be a build up of crap over every thing and you need to make sure you are lubricating the linkages, not the crap. So clean it all off then spray loadsa lube all over the place and grab your stiff lever and yank it about furiously and with intent, in and out, up and down, keep adding more lube until until it slides in and out nice and smooth (or as smooth as it gets on a land rover). Then when the job is and with your last ounce of energy, sit back and have a smoke.