It is vital that you choose which style (and primary
source) of horary that you will do.
Failure to adhere to a particular style pretty closely
will result in too many confusing decision trees.
Having said this, other sources may be added, but it is
vital that this be limited to circumstances where the
additional sources don’t clash with the primary source,
but supplement it.
For example, Lilly is my primary source, but I do
supplement regularly with Saunders, Sahl and Bonatti.