90 % of the time the best way would be to explode the mesh, just tell me if it answers your question here's a quick example: https://www.youtube.com/watch?v=bgYoXF6QmWw
@peanut Thank you for the quick response! That video helped explain exploded baking very clearly. The only main question that remains, I think, is if I have a mesh cut in half to save UV space will it handle symmetry okay or should I use the entire mesh? For example here's the center high poly.