Its 5 minutes from my horse but never been to their ODE's. but will if lots of rain doesn't come soon then the ground is going to be harder than concrete!
SJ is in the indoor school if really hard (as it is at the moment) and in a flat field by the trade stands if ok. Some people think it ican be on the big side, but I've never particularly thought that (or maybe in comparison to the XC course).
XC is a reasonable walk away but all three courses are pretty straight forward, fairly short (in comparison to others) and reasonably flat. I would describe them all as suitable for first timers, unless they have done something major to them.
BCA is easy to get to (depending on where you live of course) as it is only a short way of the M40 and M4 so no getting lost down country lanes!