As GilbertD rightly says, you will need two people at least. But it is fairly straight forward with two people, provided that the other person is fairly good with their hands. I did mine with my wife and it turned out pretty much perfect. We just looked at the fibreglass panel carefully and practiced laying down the new fabric a load of times until we got it right in our minds.
We only sprayed the fibreglass with a spray-on adhesive, we didn't bother doing the material as that would have meant laying the material upsidedown on the floor. The corners and edges, such as where the grab handles go, and the awkward bits at the tailgate end, and the sunroof cutout, took a while to do, and necessitated ensuring that the material didn't touch the fibreglass while working on the tricky bits. We started at the tailgate end and worked up the panel, also working the material outwards from the centreline to the sides.
There are a couple of decent videos online which will show you how to cut the holes for the grab handles, the roof lights and the front courtesy light. Make sure that you cut the holes from one corner to the opposite corner, crosswise, and don't cut right into the corner as you need to work a bit of material around the edge of the holes to ensure that you can't see any cuts where the roof fitting are located.
It took us about 4 hours to lay down the material, and make all the cutouts. I took out the sunroof cassette to do the sunroof panel. The edges on this panel are a bit awkward because there is very little of an edge to stick the material to, where you fold it over the edges of the panel. We used bulldog clips all around the edges and it has stayed stuck down since - about two years now.