I'm building a query to output specific data on a list of individual constituents who are pulled by the sole criteria of having me assigned as their MG Officer.  In addition to a number of other fields (name, address info, spouse, giving, etc) I am trying to output only last actions that have been added by me (to exclude institutional mailings or other people's actions.) Is this possible and if so how do I do it?

If you create a constituent query you have the option to pull on the last action.  Find this section and within it select yourself as the assigned canvasser for the action.  Add the information you want to see to output and there you go!