Spiro + E is a pretty common HRT combination. Transition-wise, you can expect more of what you are used to.
Spiro is a strong diuretic, so you are going to be thirsty / dehydrated. Drinking lots of water helps, but you pee more, so you'll still be thirsty. Your doctor should monitor your sodium and potassium levels to ensure that it doesn't mess them up. The tendency on spiro is to be high on potassium and low on sodium.