I am under the impression that most nosebleed stakes players do not use a HUD. There is a very limited population of players at nosebleed stakes, the play is much more dependent on understanding very specific plays each player makes. It's not like 50nl, for example, where I play against players every day that I haven't played against before.
So I doubt Phil Ivey uses PT3 or HEM.
Many people on this site use one or the other, and many do not. If you're interested in learning more about these tools, download the free trial software after searching this forum for threads about these tools (there are a lot of threads about these tools).
Somebody else asked recently about PT3/HEM affecting their live game - see here: http://www.cardschat.com/f13/poker-t...-games-160371/
Cliff notes - can't hurt your live game, should improve it.