Cut that creepinging cotoneaster off at the base and paint the stump with RU straight from the bottle... dig your holes for the roses, cleaning them up nicely and filling them with water... comeback after lunch and see that they've drained and stick in the roses and flood the holes again, making sure there are no possible air pockets left down around the root ball... charge one full day for the actual work and another half day for one guy to come back twice in the course of the following week to soak them in again...
That's what I'd do... and charge for dumping the plant debris...
