Define the job
Trail riding twice a week is different from competitive jumping or first-time ownership.
Training level matters
A kind green horse can still be unsafe for a novice if the partnership requires skills the rider does not yet have.
Budget beyond purchase price
Board, forage, farrier, dentistry, veterinary care, tack, transport and training often exceed the initial purchase.
Use a pre-purchase exam
A veterinarian can help interpret health findings in the context of your intended use.
Temperament is individual
Breed tendencies are useful context, not guarantees.