It will feel like some one is pushing on your teeth. The brackets stick out a bit from your teeth making it feel like you have a full mouth of metal, big lips and your bracket may rub against your lips feeling again like a metal file.
While some breeds may be more suitable than others for a beginner rider, there are always exceptions to the rule. Quarter Horses often make great beginner horses because of their even temperament, but some can be quite hot or energetic for a beginner.
at my barn Barefoot saddles are the favorite. the new model has even better rigging for the girth than the older model and my mare has stopped being so girthy. can't imagine riding in anything else. so comfortable. worth the wait and worth the price