So. This isn’t a full answer, and schooling real-life XC is super important. But you asked how you can give yourself the best chance from home, before you move onto real-life XC schooling. So let’s talk about that.
Jimmy Wofford says that all XC fences take 5 fundamental shapes. You can school these shapes with showjumping poles and standards. Behold the shapes, with corresponding XC fences:
Vertical - post-and-rail fences, wall fences, gates, brush boxes, coops and pheasant feeders with steep sides, “up” banks, skinny or keyhole fences
Oxer - hay bales, tables, corner jumps
Ascending Oxer - palisades, chairs or benches, arrowheads/chevrons, ski jumps, ascending spread fences, fan jump
Hogsback - trakehners, rolltops, tiger traps/triangle fences, coops and pheasant feeders with long slopey sides, and anything that looks like a little house with a roof on it
Obstacles without height - ditches and water
Some fences are combos of these five shapes, like the Weldon’s Wall. But even combo fences break down to a fundamental shape. A Weldon’s Wall is technically a ditch + a vertical, but for schooling purposes, its fundamental shape is ascending oxer.
So if you want to improve your odds of XC success, school all five shapes at home. If possible, take your show jumps outside and school these shapes in the open. For extra points, school them in the open, at the appropriate canter speed for your target level, and string two or three of them together. For extra extra points, get someone to give you a course map for the last event(s) at your local course, and string those specific combos of fences together.
There’s lots of bending lines on XC courses, either intentional because that’s how the course rides, or unintentional because you gave the horse a crappy approach. :lol: Anyway, pre-save your bacon by teaching your horse to navigate bending lines and jump a fence at an angle. Very easy to school in the arena or open field. Heck, you can school this with poles on the ground.
Make sure your horse is sufficiently fit and rate-able at the canter. If you don’t have space to properly school a canter or hand gallop, find some. It may be 4+ hours to your nearest XC course, but there’s got to be an open grassy field closer than 4 hours away.
Water: Puddles are your friend. If you have a BO with a good sense of humor, ask if you can make a puddle somewhere. Butter them up by offering to empty all the barn’s dirty buckets into said puddle. Shallow creeks and lakes are even better. Ask the local trail riders or foxhunters where you might find a creek, lake, or a navigable trail with some puddles. For extra points, bribe them with food, gas money, etc. to take you out there with a confident lead horse.
Ditches: If your BO will permit it, dig a small ditch on the property. If they won’t allow it, fake a ditch with two poles + some black mulch poured in between. In the arena, you can fake a ditch with two poles + a black tarp or trash bag in between. And if you’re just starting to introduce ditches, you don’t really need the tarp or mulch. Just use two ground poles + a third pole laid diagonally across it. Start narrow and widen as the horse grows more confident.
Banks: Find any kind of hillside, no matter how slight. Set up a crossrail or vertical fence on this hill. Voila, you’ve just built yourself a “bank.” It’s an up bank when you’re jumping up the hill and a down bank when you’re jumping down the hill.
Random other tips:
'Tis the season for old Xmas trees. Park them under a vertical and voila, you’ve got yourself a brush fence.
Drape random (safe) stuff over your fences and/or the standards. Jackets, saddle pads, blankets, garlands, towels, tarps.
Teach your horse to jump in and out of light/dark spaces. For example, set up a jump at the arena door, and jump in/out of the arena. Got that tip here on COTH Forums, years ago! So thanks to whomever shared that one.
Make sure you do bounces in your grid work. Bounces are fairly common on XC courses, and they encourage your horse to be catty/use its fifth leg.