Sure 
I didn't actually have a particularly short labour. It was just that my first had been two days of irregular and unproductive contractions (before drip, yada, yada). So, when my next labour started the same, we thought I was in for more of the same. And I'd been told not to call out the mw's until I was 3 in 10.
I had a doula and 8 hours in had got to the point where I was exhausted, so got into the pool for a rest, with the intention of getting out again in an hour or so. Got in, waters went instantly. Yeay, we thought, can call the mw's. Then a few minutes later I was pushing.
The first thing to be aware of is that mw's are far less stressed about this eventuality than you are probably! Everyone I spoke to, then and post natally, said that, if babies come that fast, they are normally well positioned and healthy. Complications (unless, eg you have a history of pph) are pretty rare.
The first people to arrive were the paramedics. Don't panic, but if it happens they send two ambulances (because, if you were both in a bad way they'd want to transfer in two ambulances, with two teams to work on you). They would rather send one away quickly than not have it. So that's four paramedics.
One set left almost immediately, they didn't even come in the house. Just parked up outside. The others hung around to do the job of second mw for my mw, who turned up a few minutes later and did all the post birth checks and stuff. (Well, the woman did. The bloke went and sat and drank tea in the van as we didn't need three people) This was much better than if I hadn't planned a homebirth, as an unplanned homebirth in my area I would have had to go to hospital as a non emergency transfer.
It was all actually totally fine. Not ideal, but fine. And I didn't have time to be scared because I was so involved in what was going on.
For my next labour, it was all over my notes that they were not to demand regular contractions before they came out to me, and that they should come when we felt we needed them. They were true to their word, although my third was my first non back-to-back baby and everything was rather more text book.
If you have any questions, happy to try and help. There's also a really good thread somewhere from women who've had very fast labours of what to do if you are alone - things like keeping your mobile charged and in your pocket and putting the door on the latch whilst you can.