Applying for different position

I have an opportunity to apply for a different position in our organization, but I am having incredible guilt feelings. I'm currently in a management position in home health, and the job I am applying for would be a lateral move, same pay, with 1/2 the responsibilities. It would also be a chance for me to learn new skills. The problem is that I am afraid it would take a long time to find a replacement for my current position. I like my current staff, and I feel bad for wanting to leave them, but I am also stressed with my current position and ready for a change.
Any thoughts?