Lemon Tree Help

Lemon Tree Help

I was given two lemon trees (I believe Myers) earlier this year that were brought back from Florida. They are currently in 9 inch clay pots and one of them has 4 lemons growing on it (inbetween the size of a golf ball and a tennis ball). The leaves on both plants are yellowing, but not falling off. In the past I've been known to kill any fruiting tree I've tried to raise, but I'd like to change this time and have these two trees survive. The trees looks like they need to be repotted- when I was given them they were in plastic tubs, about the same size as the clay pots they are in now. Can anyone give me advice as to what I should be doing with these babies? They will be moved into my house this weekend.
Introducing a work-in-progress.

Introducing a work-in-progress.

My Apartment

My Apartment

My Room.

My Room.

Feeding time at the watering hole

Feeding time at the watering hole

My Room!

My Room!

Potatoes

Potatoes