1st step, Unlace boots and layout shoe string and paracord. Cut two lenghts of paracord equal to the length of shoe string. [6.5 feet of paracord each] Survival tip: Why replace bootlaces with paracord?
Good question, there are multiple uses for paracord due mainly to it's strength [it can hold 550 lbs of weight] and it's inner strands [5-7 strands].
Basically, if you are in a survival situation you want cordage, but you are going to need your shoes too. Simply gut the paracord [pull out the inner strands] and relace your shoes and now you have another survival tool!
See 80 Uses for Paracord
for more details. :)