Marketing
Some might see marketing as the most important because, to put it plainly, if your home is not exposed widely and aggressively to prospective buyers, you'll never have the buyer viewings and offer(s) that must come in for you to even be faced with the high-class problem of negotiating the price and terms of a sale.
However, I don't see marketing skills as the requirement so much as your listing agent having a clear, comprehensive marketing plan that he/she is able to present to you with case studies of marketing that they've done for recent properties somewhat similar to yours. It's critical that an agent's marketing plan for your home include details such as:
- how they would help you prepare or stage your property for sale;
- what their plans are for listing the property on the local multiple listing service(s) and publicizing it to other brokers;
- what on-site marketing they would recommend (i.e., yard signage and/or open houses); and
- how and where they would place your home's listing online, down to which sites they'd list it on and how many pictures they would include.
But negotiating is essential too -- especially if you're very concerned about being bullied or taken advantage of. Ultimately, though, when it comes to negotiations, you're going to be faced with making the ultimate decisions about what your bottom-line price and other terms are, including whether you're able to offer incentives like closing-cost credits or whether you can afford to contribute to any repairs the buyer's inspectors require. What I suspect you want is to feel like you're protected, which will come from having an agent you trust who's "got your back," but also has the experience and knowledge of local standard negotiating practices and buyer psychology that comes only with experience -- and I mean recent experience getting homes sold in today's market climate. I cannot emphasize enough that one efficient method of finding such a listing agent is to get referrals! Look to any family members, friends, work colleagues and neighbors whose homes are on the market now and ask them if they would strongly recommend their agent, and why.
If it's tough to get referrals, go into the various online real estate websites and their local discussion boards, and see which local agents are giving sensible, knowledgeable answers to consumers' questions in those forums. During your interview process, ask for references -- and call them! Speak to their recent past seller clients, to see how happy they were with the agents' service.