I suggest a vacuum gauge as a preliminary check because gauges are cheap and easy to use. They come with a user instruction sheet.
The only thing missing in the instruction sheets involves the test for a clogged exhaust as there are actually 2 indicators. The instructions only show one.
Usually the easiest place to tie in to manifold vacuum is to disconnect the fuel pressure regulator vacuum hose and connect the gauge to that.
The entire process of connection and testing should take no more than 5 minutes at best.