Depending on the kind of actions that they are and the amount of time you have to work on them, 150 NAs could be several day's work or several months. If it seems overwhelming to you and is keeping you from being able to decide what to do in the moment, you could pare down the list by moving some of it to the Someday/Maybe list until some point in the future that you think you can realistically get to those items. Other ways to pare down the list might be to defer items into a tickler system, delegate them or decide not to do them (delete them).