Ok im scared i will do it wrong and my son will kill me ;)

My son has a dsi with console firmware 1.2 and is using an acekard 2i, now i know there was an issue about upgrading the firmware a few months back so i just left it, he wanted some new games so i thought i would do it all together but there is so much info and jargon around i am petrified to change the firmware, not sure what the version is now but it was done in July from acekard site!!!Any tips on where to start???Thank you in advance
Suz

This will show you howhttp://www.ndscardshop.co.uk/page16.htm#47185Alternatively you can watch it on You Tube herehttp://www.youtube.com/watch?v=i_HfVAKMxfY&feature=relatedMake sure you do it before you update to version 1.4.