The a/c will level at the MDA(or whatever you have set on the MCP) if you don't do anything. In our old outfit the procedure was set the MDA in the MCP 1 mile before ToD. The aircraft will then follow the path down. If you get alt aquire then you will be committed to a GA, however you don't do anything until you get Alt hold. Once on Alt hold you set the MAA and do a standard goaround.