Absolutely. Sigil work is most powerful in matters of WILL and SELF in my past experience. That doesn't meant sigils aren't effective beyond the self... they certainly are. But it's a short journey from "implanting" the sigil into your subconscious to controlling the SELF in matters of Astral. In fact, I'd say, it's the ideal way to get into sigil work.
The critical aspect of the work, though, is that you must perform the work as palindroem mentioned, while conscious. The goal is to focus on the intent (will), create with imagination (the sigil creation -- assuming you're creating your own) then achieving gnosis and implant the sigil (complete with the power of imagination and will) in the subconscious, which thrives in the astral. Once you've achieved this, you forget all about the sigil.
In my way of working sigils, anyway, it is important to entirely forget the sigil after you've achieved gnosis. You burn the sigil, flush it, don't place it under your pillow (which will remind you of it!)... rush to the TV, light up, play a video game, have sex, do anything to immediately FORGET the sigil, because the conscious mind has a knack of interfering with sigils. Too much contemplation and logic and visualizing (after the fact) will hamper a sigil's effectiveness.
That is unless you're actually working with talismans -- which you keep with you. A taslisman is another option for you. But a sigil you forget and destroy if it is to be effective. Here's how I define the difference... sigils are created by the creative and will and conscious mind, then migrated to the subconscious, then forgotten by the conscious mind (which can severely INTERFERE with the effectiveness of the sigil if it's constantly meditating on it. In fact, it rarely will work at all if you're thinking about it all the time.
On the other hand, in talismanic work, at least in my work, you don't forget it, (quite the opposite.) It's just semantics, probably, but sigils are generally migrated and forgotten, talismans and amulets have DUAL existence in the physical and the astral (but more substance in the astral) and are not forgotten -- they are empowered, charged, and constantly "remembered" to have effectiveness (but since the conscious mind is relatively weak, versus the subconscious, I find talismans relatively less effective -- that may just be me.
Happy journeys!
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