How to avoid an endless house hunt (© John Lund/Drew Kelly/Blend Images/Corbis)

As decisions go, it's a biggie.

When you buy a home, you're choosing a lifestyle for the next five, maybe 10, years at the very least: the neighborhood, neighbors, schools, parks, commute, yard, living quarters. It's a lot to take on. Not to mention the massive financial risk involved.

It's important to choose wisely. Oh, and please don't take too long.

It's enough to make a first-time buyer's head spin. So much is at stake, but who really wants to traipse through homes month after stressful month?

Even worse is when house hunters become so beaten down that, bleary-eyed and frustrated, they end up buying in haste. Better to put a system in place upfront. Here's how:

Take a minute to talk amongst yourselves
One couple who toured Ilona Bray's home had been looking for a year, but hadn't made a single offer. They couldn't agree on what they wanted.

Read:  5 big mistakes to avoid when choosing a neighborhood

What's your home worth?

Real-estate agents — also known as part-time marriage counselors — see this all the time.

"If you're part of a couple, make sure that you're both straight on what you want," says Bray, author of "Nolo's Essential Guide to Buying Your First Home." Discuss first, "so you won't even consider a house that doesn't have certain key features."

Same goes for parents, kindly uncles or anyone else who may be helping you with your purchase.

Tennessee real-estate agent Suzanne Karr had a client who brought her mother. Then her father showed. Then her sister-in-law.

"When we got to the last house, which she was really interested in, everyone was giving her opinions about the house and what she should do," Karr says.

The client, overwhelmed and frustrated, went alone with her agent from then on, Karr says, and bought a house she is now happy with.

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Make a list and write it down
You've surfed the real-estate websites and have some ideas. Now sit down and write out a three-part list:

1.  Must-haves
These are features in the new home that you consider non-negotiable. A good school district, for example. Or three bedrooms. A backyard. You get the idea. The stuff you're not willing to live without, and feel confident you can afford.

2. These would be nice
This is the wish list. An updated kitchen, say, or hardwood floors. Maybe a move-in-ready house. Items that you can acknowledge are wants, not needs. These may be things that can easily be added after you move in. Carpets can be ripped out, after all. It's harder to add a garage.

3. Deal-breakers
These are the things you absolutely, positively don't want. Agents should not waste your time if these are present. Maybe it's a busy road nearby, a long commute or no sidewalks or nearby parks. These are often things that can't be changed.

Write these things down and give a copy to your agent. Add to your list as you view homes.

"Those can change over time, but unless you're actually working off this document, you're invariably going to be seeing things that don't make sense to you," says Doug Perlson, CEO of RealDirect, a technology-driven real-estate brokerage.