1) For anything beyond very careful handling, I recommend additional pins into the hooves to make it more stable to the base. A single plastic leg to support the whole model and bond it to the base is just ridiculous.
2) Make sure to fit the riders to the horses before putting the arms on. The riders with the arms outstretched forward can be a nasty fit around the horses' heads.
Quite honestly, I can't say I enjoyed painting these that much. I hate painting horses, and the final assembly was very tedious. I'm glad they are done.