Some of the steps to follow are:

Set your objective or goal for the interview. Let the SME know about your goal for the interview and ask him/her if it's achievable in the allotted time. This approach lets both parties know what is to be accomplished.

1. Check what you already know. This will save you a lot of time. Take the time to read on the topic before meeting the SME. Check if there is any existing material. Do not just go for the interview without preparing yourself.
2. Make a list of questions you want to ask and organize them in a meaningful sequence. 
3. Plan for the interview. The above steps will prepare the writer for the interview. 
4. Now you need to identify who is the best person for the interview, how much time would you need for the interview, do you need approval or do you need to set an appointment. The writer needs to plan the interview by asking these questions to himself.
5. The next step is to conduct the interview and take notes. It is very important to introduce yourself and let the expert know your purpose/goal for the interview. Let him or her know why you have selected him for the interview. At the end, thank the SME for the time and also let him know that you will review your notes and you may have follow-up questions. Ask them how would they like to communicate with you, through email or PHONE call?
6. It is always a GOOD to send a follow up email or a call to thank the SME and to let them know the RESULT. 
7. The SMEs can be reached if you need any clarification on something or if you can't REMEMBER in what context he/she gave that EXAMPLE for. Most of the time the SMEs act as a reviewer of the final product.

Some of the steps to follow are:

Set your objective or goal for the interview. Let the SME know about your goal for the interview and ask him/her if it's achievable in the allotted time. This approach lets both parties know what is to be accomplished.