if you mean remove as in take them off of the stats such as your name and clan tag you simply go and select a new title of your liking, otherwise if u mean wipe them from the title page i am not aware of a way to do so
yes you do
There isn't one.
http://callofduty.wikia.com/wiki/Callsigns
By getting into a tenth prestige lobby.
Yes you lose everything but titles and emblems
Lots of people do by hacking very few probaly 2 or 3 actually have all titles
do some challenges they will unlock it for you ------------------------- Completing every challenge will unlock every title.
Do it with a buddy play 3rd person cage match with each other.
no. for prestiging you only unlock new titles/emblems extra custom classes and a new symbol.
From prestiging in modern warfare 2 u get an extra custom class and new emblems and titles.
Yep. I have all of them, and I am Prestige 1 and Level 70, except the Prestige 10 title.
Sorry I'm not sure what you mean but spectre refers to the ac-130. You can get different spectre titles and emblems if you want...