I find that Lenormand works very well for Yes/No questions as long as you state your question well, have a system for determining the answer, and carefully check the accuracy of your answers to see if it works consistently for you. As with all divinations, know that changing circumstances can change what will occur, but you should still be getting fairly reliable answers if you are to use this system.
What system you use is up to you.
• I use 3 or 5-card line readings that generally function as past-present-future from left-to-right. I prefer 5 cards.
• Similar to Sharla, I've designated 9 negative and 9 positive cards, which I use to count yeses and nos. I may pay some attention to neutral cards that lean toward more positive or negative especially if they refer directly to my question (are they adjacent to pos or neg cards?).
Your question.
• Be concrete and specific, and include time deliminators - "by this coming Friday," "within the next two months."
• Separate either/or and multi-part questions into two (or more) questions and draw a separate set of cards for each.
• Make sure that positive cards answer your question positively and negative cards, negatively.
For instance: "Will it rain during the wedding tomorrow?" If you got the Sun card as an answer, then is it saying "Yes, it will rain." Or "No, it will be sunny." You need to be sure.
It is far better to ask "Will the weather be good for Sue's wedding tomorrow?" Sun card says "Yes!"
Before pulling cards check a positive/negative card response to make sure you've phrased your question right!
Sometimes a question does not have a clear answer, which could be attributable to many reasons. You can read the cards for more elucidation, but do not stray from your question. In other words, a question regarding "Will it rain?" should not be answered with "Plan the wedding for indoors." Likewise, "Should I accept job A?" should not be answered with "You'd be better off becoming a carpenter." Only answer the quesion asked! Don't give advice where it is not asked for!
Many questions are better asked in other ways.
For instance, "Should I take job A or B?"
• In the first place, this should be two questions (as recommended above).
• Rather than asking Yes or No, it would be better to determine what information you really need to make this decision.
You could do four 3-card readings:
"What are the advantages of job A for me?"
"What are the disadvantages of job A for me?"
(and likewise for B)