Alternatives
Moses,
Greetings from Dayton!
I soloed my LT-40 this summer and would not advise anyone to try and learn on a 4*. I am, however, building a 4*60 this winter as a second plane.
Some possible alternatives to buying a trainer. Borrow or "rent" one from someone in the club. That's assuming the club doesn't have a trainer or limits the number of flights you can take on it. You may find someone who has outgrown a trainer but doesn't want to just get rid of it.
I think you'll find that a few dozen flights on a trainer will move you towards your 4* much better than trying it first and getting frustrated or (worse) smashing it to bits.
GB