If I can offer some advice: 

1.  Walk early and walk often. 
2.  Practice your fuel plan.
3.  IMO - Time on feet > mileage 
4.  If you have a crew, incorporate them into your training and give them an aid station checklist to go through.
5.  Change socks/shoes as needed (I only did one change on a 100 miler, probably should have done one more).

Have fun!!!