Have a poke around the boiler even just for curiosity sake.
When we first ran out of oil last year, I couldn't get it going, especially as I had no experience.
Had a browse around and found a manual online for the riello burner within the boiler. All I did was loosen the bleed plug with a rag around it and let the kero bleed through and into a small plastic container. Tried a few more test fires (red reset button) with a little more bleeding then the thing came alive again with the air out of the system.
Not hard and I didn't implode
But our tank is down the bottom of the garden ~25m away on stilts so mavity fed. New one is 3m from boiler and lower than the boiler, so am going to have to fit new pipework and a tiger loop. Should be fun