Why should you be forgiven David?
Have fun with it, and consider it a learning experience - something new and different. There are things you'll dislike about the system, and other things that will delight. Same for me when I use a PC from time to time.
Try out Apple's iWork suite first, before you go buy Office. You can download "Pages" (Apple's Word) for about $18 from the Apple App Store. THeir spreadsheet application is called "Numbers". Very intuitive and completely capable of outputting Microsoft-compliant export files.
I'm looking at a new MacBook Air next week too - the i5 11" version. It should fit in nicely with my fleet.