Shift the rear derailleur to the smallest rear cog
Move the chain onto the front chainring
Pull the rear derailleur cage forward to create slack
Place the chain over the smallest rear cog
Rotate the pedals forward by hand
Guide the chain onto the chainring teeth if needed
Check that the chain is seated on both front and rear gears
Spin the pedals slowly to confirm smooth movement
Stop and realign the chain if it slips off again