Self remapping

Hi all I brought a diagnostic device online which you need to use your laptop after installing the disc I had many options like change miles on clock read maps and write maps ect aswell as diagnose problems
Has any one done this before thereselfs remap there own cars if so what was the outcome I have a 1.2 16v sporting is my car possible to self remap id like a litte bit more omph my car is standard at mo just a straight thru centerpipe fingers crossed am getting given a 421 manifold and will get sports exhaust soon plus have induction kit in cupboard which I mite stick back on

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i would think unless you know wat your doing it could be quit complicated to be honest.

ya i agree with scottish saying