Deer have an advantage over you when it comes to their sense. Their hearing is excellent, and did I forget to mention that they can almost smell you from a mile away. It would be best if you took every precaution necessary to stay undetected.
You can also be smart and let the deer come to you. You can achieve this with the use of deer callers and some scents. This page is dedicated to organizing the deer callers and types of scents available.