Easily Get USER ID and User Details
https://api.instagram.com/v1/users/search?q=[ USER NAME ]&client_id=[ YOU APP Client ID ]
For Example:
https://api.instagram.com/v1/users/search?q=zeeshanakhter2009&client_id=enter_your_id
Result:
{"meta":{"code":200},"data":[{"username":"zeeshanakhter2009","bio":"http://about.me/zeeshanakhter","website":"http://zeeshanakhter.com","profile_picture":"http://images.ak.instagram.com/profiles/profile_202090411_75sq_1377878261.jpg","full_name":"Zeeshan Akhter","id":"202090411"}]}