The LEAN Startup movement has the answer: you test your idea by designing and running experiments.
I've been using and teaching LEAN Startup for 5 years and I can teach you with this gig, exclusively on Fiverr.com.
I'll need you to tell me your idea and I will help you design a set of experiments that will help you test it in order that you spend your time and money on the right things.
Experiment plan template
I will provide a LEAN experiments template and I will review and help you develop it
You get a template that I have used for years with suggested experiments to be done. I've designed and run hundreds of LEAN experiments so I've done the hard work for you
You can, and the more you tell me about your idea, the better I can advise you, however what you tell me about your idea is up to you
As an example, let's say your business idea is for a mobile app to connect neighbors to share DIY or garden tools. Assumption #1 is that enough people would happily share their tools. Experiment #1 therefore would be to run a survey in a given street to ask homeowners whether they would participate
One of the many benefits of LEAN Startup is that helps you make sure that your idea is the right idea before you build anything or invest any further time. The experiments you do may persuade you that need to re-think your idea - pivot to a different idea or re-think it completely
You run the experiments. I can add value by helping you, with my many years of experience design the best experiments and define the success criteria