Hi Mark,
Let me just second Jaap's post. I am 69 and have been using Composer since 2005. If you are able to go back and read some of my posts from then, you will see I had zero computer skills. You will also see the progress of my compositions and arrangements. Not only will the software do what you want with little computer skills, but you will actually eventually amaze yourself with what you have done with it. Go for it!!
Cheers,
Fred