
It
is very difficult for a novice as the whole issue could take a three page thread and people still won't agree just what constitutes an acceptable animal to breed from therefore for a novice I would suggest you check on the ABS whether the breed you are interesting in is
recommended as having hip scores and look only for breeders that do. As far as the score it self, again for a novice, it would be much simpler to look for parents that are below the
average for that breed.
I think only if you are considering showing and breeding do you really need to look more deeply as to whether breeding from dogs with higher scores are justified in any particular breed due to the other consideration of the gene pool.