Make a 'pistol' with your hand. Left hand for LH holds, right hand for RH holds. Your extended forefinger represents the inbound track, angle between thumb & forefinger represents the Sector 2/teardrop position and the angle between forefinger & little finger knuckle equates to Sector 1/parallel entry.
Hold your hand against the DI/HSI/RMI with your forefinger pointing to the inbound track to see where the various sectors are. The a/c is represented by the bottom of the instrument, moving towards the 'aid' at the centre.
You might have to adjust how you shape your hand as the 'pistol'to get a more accurate sector representation - I do - but usually not a big deal. I adjust my hand so that my thumb's 1st joint is touching my forefinger's knuckle. Has the added benefit of making that knuckle more closely represent the origin for all radials/bearings