Re: Need to replace a breaker in my panel
First of all it will depend on the size of the wiring in the 20 amp service. If it's only 12 ga wire it should not be put on a 30 amp breaker. The proper way to do it is to remove some of the load from the circuit and put it on a separate breaker. You should never put a breaker larger than the NEC rating of the wiring allows. If you end up with an electrical fire your insurance could refuse to pay.
Be sure you live your life, because you are a long time dead.-Scottish Proverb