As a trainee shaman, I am able to give an opinion.
Physical shapeshifting would take a great miracle, and lots of effort. It may take a while to achieve the results you would like.
I am trying to shapeshift into a doe at the moment, and have only managed one hands fingers to become hoof like and a little bit grey.
However, if you do not do it correctly, you may have no control over your animal body, or not be able to turn back. But taking the time to help yourself become a shapeshifter is a great chance, you may be victorious in becoming one, which would be rare, or you could simply end up muddled up and confused.
If you want to work up to the actual shapeshifting, it is better to do a thing which some shamans may call 'Joining' which is just the mental joining of an animal to yourself, if you want to get the physical change well enough, it is best to join with the animal you want to morph into. Seeing what they see, hearing what they hear, smelling what they smell, touching what they touch, and tasteing what they taste. You should be warned though, do not do this for a long time, for the animal itself will also get strange feelings.
If you want to make a quick commitment, it would be better to contact a shaman who has theirself made the change.