I know what you mean.
Currently I am afflicted with impatience in that I feel my progress is not as fast as I would like. But anyways:
If you are feeling other signs of a weak fire within yourself (limited passion, confidence, motivation, etc) I will leave my personal rendition of a combination of meditations: what I refer to as the "Hellfire" meditation.
It's a mix of the Blue Light Meditation and Invoking Fire.
1. I typically start out with a saying such as, "Of the dark there are no others. Supreme, strong, a protective figure. One to call Father. I call upon his light - a hellfire of blue. To burn away the bindings and so I may set myself free too." You may call out to Satan in whatever respectable way you wish.
2. Enter a trance, picture yourself engulfed in blue flames. Feel the temperature, though do not imagine yourself actually burning. Also feel the light sensation of the color blue, how it eases around you and keeps you calm.
3. I typically try to 'see' the bindings on my soul or walls in my path and imagine the fire burning them to ash.
4. With each inhale, absorb the energy of the flames. Like foundation meditation, breathe the flames in from your front, sides, back. Hold and imagine the energy ever brighter inside of you, burning away any dross you can feel. Exhale the flames.
5. For beginning this meditation, it is advised to only do a max of 7 breaths!! Even 2-3 breaths are fine, do NOT over do it. Even if you do not feel the effects immediately, you may feel them later.
For more information:
Blue Light Meditation:
http://www.angelfire.com/empire/serpentis666/Blue_Light_Meditation.html
Invoking Fire:
http://web.archive.org/web/20150915034201/http://www.angelfire.com/hailtosatansvictory666/Invoking_Fire.html