You'll be fine
My wife and I had our son at home and I must say I wouldn't do it any differently. I do have a few pointers for you
1. Communicate beforehand, communicate beforehand, communicate beforehand. Your job is to do exactly what she wants.
2. Be prepared for anything. Have the phone numbers for ANYONE you may need to contact. The last thing you want to be doing is asking her a number or how to find it.
3. As the due date approaches, make sure you have a working knowledge of where all the supplies are.
4. What I didn't do, but will this time, is make a few meals beforehand that can be frozen and reheated when needed. This helps in case of a long inactive period and after everyone leaves.
5. Be prepared to stay awake. I made this mistake. Trust me, it will come back to get you. I had just worked a twelve hour shift and then stayed up all night during her labor. After my son was born and things settled down, I fell asleep on the couch. DONT DO THAT!!! Keep yourself moving and make sure everything that needs to be done is done. Offer her the chance to sleep first. I promise she's more exhausted than you are.
That being said, congrats on choosing a home birth. I'm sure you will be extremely satisfied with your decision.