dont know about anybody else, but i make the mix quite wet so its easy to place the coving and push it tight in to the corner.
also when u dub the coving up make sure u apply the adhesive generously, so when you push the coving to the corner and remove the excess adhesive you dont have any gaps to fill in. saves time
its always handy to have a hammer and nails, to put a nail under the coving at the join
when it comes to cutting i use one of those wondermites
i tend to cut and fit all the big piece first, the measure cut and fit the small piece, remove excess adhesive, then clean with a brush.
also cut the joins at an angle, and fill all joins, with interior filler