While you might remove it, reinstalling the pump motor with the assembly in the car is near impossible. The motor drives the pump via a coupler with an offset slot. There isn't sufficient room to ensure assembly of the motor into the coupler and the coupler onto the pump shaft with the motor in a horizontal orientation, not to mention you can't see anything.
Pulling the entire assembly is not that difficult. the only issue I had was I had a fluid fitting that just wouldn't budge and ended up needing to be replaced.