If I hear a scholar or someone who recites majalis recite a hadith, is there any hadith available which allows me to accept that hadith without trying to research each one as to it’s authenticity? I have a naturally questioning perspective in life but I don’t want to question each thing I hear without inadvertently sinning some how.

One has to have a background in the science of Hadith to be able to know if Hadith he hears is authentic or not.
Another way of doing it is to approach the Maulana/Sheikh for the proof of what he is quoting