Hands and feet always shaking, how can i tell if it is parkinson's?

Some thoughts: Agree, it's not as simple as looking at the tremor. Parkinson disease is a constellation of findings, of which tremor is only one. That said, Parkinson tremor tends to be asymmetrical, medium to large oscillations, circular (rather than back and forth), less evident with attention. But, not always. Tremor can be absent, odd form, other variations. Its a "whole picture" diagnosis.