You may find it impossible if the rope is used. 
If you have never done it before, only use new rope. Used rope quickly gets too tight to splice but without any experience you may not know what is happening.
Fairly lightly used line can be softened up by washing it but if it has been stretched taut very many times it becomes nearly impossible to splice no matter what you do.
If you have never done it before, only use new rope. Used rope quickly gets too tight to splice but without any experience you may not know what is happening.
Fairly lightly used line can be softened up by washing it but if it has been stretched taut very many times it becomes nearly impossible to splice no matter what you do.