That's no problem, Mark.
Taking off the bumpers is not a big job and putting them back on also isn't.
Aligning bumpers is also not the most difficult job to do.
If so, it is most likely that the bumpers /or the brackets were bent before; then indeed aligning is a tough part.
It is even advisable to take the bumpers off; you can better get the nuts out of your bumper guards etc. And especially maintain the inner side of your bumpers:
remove dirt, debris and perhaps some rust ... and painting them freshly in 158 white-grey (semi-flat), if necessary.
Good luck
Achim