Buying or selling a home is unquestionably one of the biggest and most important transactions in a person's life, financially and otherwise. The ins and outs of the entire process can be overwhelming, particularly for first-time homebuyers or sellers. There's mortgage loan paperwork to manage, open houses to attend, inspections and appraisals to coordinate, not to mention all the different people involved. While it may seem daunting, rest assured that everyone who plays a role in real estate transactions is essential. Two of the key players involved are also two of the most commonly confused: Listing agents and selling agents.…