PonyIsland

Ok... I'm not an expert by no means, but I definitely have my opinion on the best way to do a breeding challenge.

#1, only do breeding challenges if you enjoy them. The BP/PG reward is not worth all the time, stable, and other resources that are going to go into the challenge itself.
#2, only keep about 5 to 10 ponies for each challenge. It took me a while to realize that if a mare is 50 pts away from the goal, she's not going to drop an ideal foal, instead sell her and let her granddaughter who is 25 pts away give it a shot.
#3, I prefer extremely hard challenges because I only have to worry about one hex, and the fact that the hex is clearly defined keeps me from getting frustrated when I'm doing pony searches. I do one impossible quest at a time just because I like the challenge.
#4, I usually start with one mare and one stud (or sometimes I breed with someone else's stud). One will have all high numbers, the other will have all low numbers. I always keep the first 3 babies born, especially if they are girls, but after that I make sure that the new arrivals beat their older counterparts. I go as far to calculate how many points they are away with a free web calculator.
#5, if you want to spend the bp you can gen a pony or ponies to win the breeding challenge, but you're going to spend more bp than can earn to do this. If you choose to gen a starter, I suggest coming up with a dreamie with similar hexes. That way you're not just using the bp to when challenge, you are also going end up with a high quality pony.

I hope this helps.

lol ok thank you guys soooo much!

I like opening breeding quests on my training accounts. I often breed for training stock baby's so when I complete a breeding quest it isn't such a big deal. It also shaves off a step when I am questing to have all the breeding quests going.