Not sure if i fully get the question, but if i do...

In the Cessna, you can twist the knob, called an OBS, to the 63 degree heading, but this is optional as the instrument doesn't really care what the OBS says, its the same indication either way.

On the jumbos though, the OBS setting does matter (well, it really doesn't, but it makes interpretation easier to line up the indicator up down so you can tell your position).

Intercept at 30 degs or so, in a big plane shallow out your approach as you get closer, in a cessna its not a big deal, you can fly right through and correct quickly if needed. Use the GPS for help at first, you can see the ILS path and judge your angle.