RE: No fancy battery cycler
No do not leave them on and contrary to popular opinion you will do just fine without a "fancy battery cycler".
Simply charge the Tx and Rx overnight before you go flying and fly. Then charge them up with your wall charger agine overnight before you go flying. Even if you did not fly on an outing and its been over a day later then charge agine. This method has been used by the majority since the begining and will work just fine for you.
One item you do need without fail is either a loaded digital or expanded scale volt meter so you can keep track of your batteries between flights and this is preferable to those volt watch things. Hobbico ESV's can be had at tower for as low as ten bucks.
John