new bathroom issue

I have quite a huge problem right now. I mean, it may not be as terrible as I think it to be, however, it still freaks me out. Me and my wife decided to move out from our old house and we just moved in to a new one. After the whole phase of moving out and moving in we are quite broke to be honest, we lack of money... Of course, again, I am exaggerating a bit but it still bothers me as we can"t hire professionals to do the corrections and few things that has to be done. Now the problem begins as my wife is pregnant and she can"t really help me, she is like a little dictator now, she tells me what to do, all the time. Few days ago she came up with a ‘great" idea. She told me, that if we can"t really hire professionals do to the job, I will do it. So she immediately started with planning the arrangement of our new bathroom and of course, I will be the one who will have to buy this whole stuff and put it in our new bathroom and this is the thing, which freaks me out. I am not a plumber, I have no idea how to connect a bathtub or a shower or a sink to a water pipe. I can bet that I will drown my whole house in water while doing that. I am a teacher at school and I don"t really know how to do those house works, I am not a construction worker, it is not my job I won"t handle this new bathroom issue.