Here is the procedure I used today to select the approach...We are at PAMA with a FlightPlan filed (LOADED) for PAMA to PAMA.

I have used the top left smart button to select GPS2 as the nav device and these pictures will refer to me clicking the buttons on that lower GNS430 in the radio stack...I have fired up the two GPSs to their normal state with each showing the normal little map (there is no flight plan track to display as the flightplan is from here back to here!)...Now I will click the FPL button on that lower GNS430 and...

...it shows the flight plan PAMA to PAMA...Now I will click the PROC button and...

...and here you choose "Select Approach"...It is flashing already so you just click the ENT button and...

...the available approaches are listed...today's wind favours runway 13 so I have clicked the RIGHT OUTER KNOB + once to bring the flashing cursor down to ILS 13...Click the ENT button and...

...the available Transitions will be listed...I have moved the flashing cursor (RIGHT OUTER KNOB +) to flash on DAWNA...Click the ENT button and...

...you are offered Load? or Activate?...I have moved the cursor to Activate?...Click the ENT button and...

...you can see that the approach has appeared on the PFC and on both GPSs with DAWNA flashing so click the ENT button again.

In this aeroplane the approach also appears on the MFD Map and as soon as the Autopilot is engaged and its NAV button is pressed then the aircraft will fly the procedure.
If you fly ATC then you will get ATC IFR clearance for this flight as you have filed a flight plan...However, you can cancel this IFR clearance as soon as you are airborne, to avoid radar vectoring...You can then let the autopilot fly the procedure. Remember the you are responsible for the altitude and terrain clearance until established and locked on the glide slope :flying: