Finally figured it out. Here’s what you do. Run the DOS command-line with administrator privileges. Then, CD into the directory under your github repo that has \Engine\Build\BatchFiles. Then run RegisterShellCommands.bat.
Running that will make it so that when you right-click on a .uproject file and click “Generate Visual Studio projects”, it will create a .sln that is set up to use the editor under your source code directory instead of the installed one. So, do this for your project’s .uproject file.
Then, open up the .sln for your project and Build it with the Development Editor/Win64 configuration. Press F5. Voila.