Medical antiques are rare and it can be both fun and a challenge learning how to hunt them down. Aquiring the skills needed to do this takes time, so too does the actual hunt.
But even with sensible advice, if you are just starting out then there is a good chance that you may end up paying for your education with some questionable purchases.
Don’t worry too much about this. Enjoy the process and learn as you go and later your good buys will probably make up for any early losses.