Not many people drive a team of 4 or more. It is a military operation that involves a great deal of time, money and luck!
It is a totaly unlike driving any other combination. If you have ever driven a tandem or a unicorn you will have a feel for it.
You have to have at least 4 horses who will all work together, and with the 'spares' that you will need incase any member of the team is unsound.
Idealy the horses will go as wheeler or leader on either side!
They all need to have matching ish paces & size.
They must all be fit & kept fit.
Now you see that what you are asking of the horses is difficult, verging on impossible.
Add to this the fact that not many people know how to drive 4 or more inhand, you can't just pop off for a lesson... it is also incredably dangerous!
Idealy you need a private income, a large estate to practice on and staff!
Alternatively you can go and learn in Baveria!
http://www.intetra.net/homepage/anemitz/main_e.htm
Thats where I learnt... and when you concider all of the above difficulties, the Bavarian coach driving is a bargain!
I am still breeding my team. I am up to a unicorn at the mo... all should be up and running by 2009! I hasten to add that I don't have millions of pounds, I am having to breed the horses, break em myself and save up for the harness!