Thanks man!
Tough Mudder is 80% mental (the other 20% is just being about to cover 10-13 miles.) Just keep putting one foot in front of the other and you'll finish. Sounds like you're pretty much good to go now, honestly. Before I did the TM the longest I ever jogged in a solid go was a 5k! I'm not saying it was easy by any means, but being mentally strong when you're cold, soaked, covered in mud, and just wanna lay down is important!
Now, if you wanna run it and complete every single obstacle without failing any...you'd need to be pretty tough.
90% of the people who do a Mudder won't run the whole thing, feel free to just walk for a few miles. You'll fall off obstalces, get filthy, laugh a lot, help other people, and have a great time. If you can't do an obstalce, or worry you might get hurt doing it, skip it. "No shame in that game!" as they will tell you during the starting line speech. Have as much fun as possible and earn that orange headband!