Go to, http://sacred-texts.com then go to search by name or author and is for free you will find all instructions, I actually have done my seals on parctment paper.
"The Key of Solomon The King"
(clavicula salomonis), will also see the lesser all religion and you can print the whole book and all the sigils for free!!
Well, As they say "To Know, To Dare, TO Will, To keep silent." In my perspective you should try it, but you must be ready. You must know the basics, like meditation, Directing energy, Projecting energy. I believe that the keys of Solomon are mostly favored by High Magicians, even though if you look closely it is more "Low magick" than actual "High Magick."
If you are speaking of the "Greater key of Solomon" on which the many seals are listed for their own purposes I will tell you a secret about it. The seals are not for consecration (or at least, your view of consecration)they were for showing to the spirits when they were summoned (Like the ones in the Goetia.) Instead of speaking the name of the demon, you speak the name of the archangels of it's correspondant nature. If the Pentacle is from Venus then use the archangel of Venus or angel of Venus. Try it.
If you are saying that I speak of false and folly, then read the entire "Greater key of Solomon" there is the invocation there that speaks of the Talismans as not only a sort of jewelry or pendant or the like, but they were called "Spirits." Skimming the pages of books like these is rather unwanted because books like these (Grimoires) usually focus on the "Summoning" part like the Grimoire of Pope Honorious, Grimoire of Armadel, Heptameron, etc.
Those talismans were meant to be showed to the spirits for them to fulfill their bidding rather than the talismans to be merely consecrated like any other object. They are special. Of Course, Society has changed, and you may use the talismans for your OWN version of consecration but I am merely saying the Original process in a way that it was traditionally handled and performed.
Beware of the Keys, I have brought much pain to my family because of it also. My mother stole money from my box, which I had placed the Talisman upon and the other signs of Jupiter. The end product was after she got the money her legs had somehow slept and she had heart problems after, she had palpitation of the heart, paranoia, and drastic drop of body temperature. I did not know back then how to reverse it, and I still don't but that was it's purpose, to protect my money from people who try to steal it. My father accused me of "Black Magick" and then I chuckled, and said "She stole it, why am I wrong" then it went on and on.
So that's probably it, I welcome any critiques or comments on the subject. THELEMA et 93!