Okay, let's go the work

1 Open the tailpiece

2 Detune the string

3 Cut it

4 Take of the bottom

5...and the top( it's hot, darling!) ( do the same for the other chord doubled)

 6. Insert the new one

7. Stick it

8. Make a knot, like this

9 Turn, turn, turn

10 Near the good note, pluck it, and slap it !

11 Tune and cut the surplus

That's all folks ! ( make the same thing for the others)