Can I use stealth...?

[gnomewizard]

To hide certain parts of my casting to disquise it against others recognizing the spell.

[BigNorseWolf]

gnomewizard wrote:

To hide certain parts of my casting to disquise it against others recognizing the spell.

Nope. Once you're casting the dc to spot you is 0.

[LazarX]

Forgotten Realms had the Thematic casting feat which would up the DC of identifying the spell being cast. but there is no such feat in Pathfinder Core.

Just remember though if you're casting a spell in front of a person who's not your bosom buddy, they don't have to identify the spell to come to the conclusion (justified or not) that you're making some form of magic attack upon them and respond appropriately.

[snobi]

From Races of Stone:
"SLEIGHT OF HAND
(DEX; TRAINED ONLY)
Sleight of Hand is a well-known skill of rogues, thieves, and street magicians everywhere. It also has a practical use to the magic-using world, allowing spellcasters to cast their spells while avoiding the notice of others.
Check: When casting a spell, you may make a Sleight of Hand check to make your verbal and somatic components less obtrusive, muttering magic words under your breath and making magic gestures within your sleeves. Your Sleight of Hand check is opposed by any observer's Spot check. The observer's success doesn't prevent you from casting the spell, just from doing it unnoticed.
Action: None. You make the check as part of your normal spellcasting.
Try Again: Yes, but after an initial failure, you take a -10 penalty on a second Sleight of Hand attempt against the same target (or while the same observer who noticed your previous attempt is watching you)."

[Caineach]

One of the late 3.5 books (complete scoundrel I think) has skill tricks, one of which allows you to use bluff to hide verbal and somatic components of casting in regular speach.

Nothing like this was in the core 3.5 rules, and it hasn't been ported over to Pathfinder to my knowledge. That being said, it makes a very good use for those skills and is something I think the rules should allow relatively easily (though opposed by the other person, not a static DC).

[james maissen]

gnomewizard wrote:

To hide certain parts of my casting to disquise it against others recognizing the spell.

Not in PF. There were a few ways to go about this in WotC 3.5 material. There was Disguise Spell for Bards, a few skill options listed out in other splat books, and I think some things in FR settings etc.

I would talk with your DM about it. Perhaps researching a spell or having him design a feat for it for you.

-James

[Quantum Steve]

You can't hide the spell while you're casting it, but you can hide yourself. If they can't see you, they don't know you're casting.