It always pays to have a look at any Reviews and check for star rating.  If a Pro is new to Goodnest, ask for pictures of similar work they may have completed. Check out their site, and look for other reviews on the web. 

Ask for any relevant registration numbers so you can check their registration. It’s a very simple process, for example: If you’re hiring a plumber, once you have their registration number just go to the PDGB website here and type it in. This will tell you if they are currently registered and which services they are registered for (You can do this for electricians and builders too).

Follow your instincts.  You need to be satisfied the Pro you’re dealing with is reputable.