From experience picked up over many years.
1 Clean the front of the glass before you remove the back and the reverse of the glass after.
CAUTION: Bendy clips and mount card bevel are sharp. Glass present: treat with extreme care.
2 Insert print, with or with out back, remove bits from under glass, remove labels. Trim top and sides with scissors if needed.
CAUTION: Take care using scissors and of upright bendy clips.
3 Insert backboard, carefully push down bendy clips. Tape around edges to reduce number of Thrips.
CAUTION: Bendy clips are sharp.
4 Measure one third down from top on each side, mark with pencil. Add "D" rings, then cord.
CAUTION; Take care when using screwdriver and scissors.
5 Tie cord tightly with several knots. Neaten free ends with tape.
CAUTION: Take care when using scissors.
6 Finished print. Stick labels to reverse. Hang. Enjoy.
CAUTION: With heavy frames make sure that your wall and fixings are strong enough. Beware of underlying pipes and cables.