I really want to stress that this is not meant to be mean.
It is really important to read and follow directions when making changes like this to your phone. Usually the original post will have directions but there are tons of places to find simple, easy to understand directions.
I haven't read anything that said to hold the volume down button. The choices are volume up + end or call + end. In this case, the consequences of messing this up weren't bad. Other times like flashing radios, rooting, etc., you could end up with a brick.
I just want to reiterate that its a very good idea to read directions thoroughly, take your time, and if you aren't sure what you are doing, don't do it.
Again, not trying to be mean. I just really dont want to see someone brick their only phone because of such an easily avoidable mistake.