Remodel Projects Needed

I have three bathrooms.  Well, really 2.5 bathrooms.  The two full baths are upstairs.  Both of these bathrooms are far from perfect.  As a matter of fact, they both will require a full remodel process.  I don’t have the money to hire someone else to do it so I will most likely be doing the work myself.  I was told that I needed to use small bathtubs for these rooms.  I didn’t even really think about that when I bought the home.  Who thinks about the size of tubs when purchasing a home?  I was mesmerized by the kitchen, three car garage and the large backyard.  Where can I learn more about my options?