First download the appropriate approach plate for the destination airport........this will tell you the ILS freq./heading/altitude for the ILS runway.......
then.....
- set your NAV 1 radio to the ILS freq......make sure to change to NAV from GPS IF your flying GPS........when your within 30 or so miles and at an altitude reasonably close to the ILS altitude it will show up on your HSI.....
- Make sure your AP CRS is set to the appropriate runway heading.......NOT the HDG
- Make sure your level at the appropriate altitude listed on the approach plate for the runway you intend to utilize......
- approach from a heading of less than 90 degrees to the approach/runway heading....(although the AP will "catch" the ILS from 90deg it's not advised nor a good practice....anything within 30 degrees is good)
- Once you can see the ILS acronym listed on the HSI you can activate the AP APPR......
- You should see the AP "catch" the glideslope and the heading bar on the HSI "slide" towards the center.......very close to the same time you'll notice the plane make the appropriate turn to line up with the runway........
- Once you actually enter the glideslope you'll see the lil' bar/arrow on the right side of the HSI begin to drop which indicates your beginning to enter the glideslope.......when the arrow/bar reaches level the plane will begin to descend.....WATCH YOUR AIRSPEED!

- Don't do a thing till you can actually SEE the runway at which time you can deactivate the AP and hand fly the airplane to land......OR you can continue to wait until the plane is very near the runway.....not that great a practice in real life as you don't have much to "correct"/abort if necessary......but if the plane was properly trimmed and your airspeed is correct you can almost let the AP land the airplane......some AP's will actually do it.......
I'm about a 15 hdcp., but, I think the information above should get you going in the right direction.....
