headliner

Hi guys, the headliner over the rear seats has began to sag down. Wondering what the best plan of action would be to fix it? ive attached some pictures Any advice is much appreciated :)

I have a 2011 Clio and i want to remove the headliner, im gonna be spraying all the pillars, sun visors, grab handles and dying the headliner. So my 2 issues; How do i take off the grab handles? How do i take off the white clips behind the sun visor cover (where the stem is) and the bit in the...