Hi Peter,
Sorry to hear it didnt work as intended with the goto.
I would use a star program/app like stellarium and confirm you know both alignment stars. Alpha Centauri will look like two yellow stars in an alignment eyepiece. The second star you choose i recommend you know what it is and looks like.
The second slew is usually a bit off and its sometimes hard to work which star is which. Usually you pick the brightest stars in the sky to align against.
Maybe have a telrad/rdf to assist , so you know with the naked eye what the scope is pointed to assist.
Hope it goes well
M11