You don't need a lab or 50 participants. Five users find 85% of usability problems.
The Process
- Define 5 key tasks ("Sign up", "Find pricing", "Create a project")
- Recruit 5 people (friends, colleagues, UserTesting.com)
- Watch them attempt tasks — don't help
- Note where they hesitate, click wrong things, or express confusion
- Fix the top 3 issues before next round
What to Ask
"What would you click to do X?" is better than "Do you like this design?" Opinions don't predict behavior. Tasks do.