When you go through the painstaking process of creating all the tools, talismans, implements, and Magic Circles of the traditional grimoires with the heart of the true magician, on fire and enflamed with the passion of your true Love, you go through one of the most rigorous and life changing initiations possible.
The creation of a real talisman, from raw metal to finished, engraved, consecrated talisman is a process of transformation that is Alchemical in every sense of the word. After you've made and consecrated a talisman, you've interacted with the Four Elemental Kingdoms in all three of their phases, you've spent an extended time in the presence of the spirit who works through the talisman, and that interaction as you and it worked together to create the finished thing and brought it into being in the material plane has forever changed the harmonics of your sphere. You've been tuned through the properties of spiritual resonance.
When someone like Mr. Ashen or Mr. Cecchetelli goes through the process of creating the tools for his Solomonic rites, he's going through that initiatory process of talisman creation at every stage of the preparation. His heart's aflame with the passion of his intent, and that intent blazes through the Spheres, a clarion call to the Spirits.
How many of these initiations do they go through to perform something like a conjuration from the Lemegeton's Goetia? How many times do they end up inscribing the Ten Names and Seals of the Intelligences of the Spheres? At least twice, for the lion's skin belt, and for the Magic Circle they stand within. You make a MAgic Circle full size, and it's incredible how you feel standing in the center as the paint dries. You feel the spirits aiding you as you write out their names, and if you're trying to do it without the right heart, the right attitude of reverence, they invariably smack you down and make you start again.
It's a Holy process.
A process of transformation.
If you're having a hard time seeing and hearing the spirits, take a few months and devote it to creating all the implements of the grimoire of your choice. The Almadel, the Arbatel, the Ars Paulina, the True Grimoire, the Art of Drawing Spirits into Crystals, Crossed Keys, the Order of the Black Powdered Octopus, The Greater Key of Solomon, Abramelin, Samekh, the exercises in Strategic Sorcery or Protection and Reversal Magic.
Do them well, do them honest, do them pure and true, or as true as you can, and it will start that process of change that leads to the visible and audible manifestation of spirits.
Unless you're spiritually blind and deaf. It's a condition that some people have, and it's nothing to be ashamed of, although it's certainly frustrating. If you've gone to all the work of putting together a straight, by-the book rite, and you've performed it at the appropriate astrological timing, and you've meant every word you've uttered, from the heart, and you're still not getting anything, and you've done it a lot more than once with zero results, don't despair. There are several grimoires that suggest working with a seer because the simple fact is this: Everyone doesn't see or hear spirits. That doesn't mean the magic doesn't work, it just means some folks are deaf and blind to the spirit world for whatever reason.
And who knows... it might be for a very good reason.