For some backstory, I've worked with the Arbatel spirits on and off for the past 7 years or so. I first stumbled on them when reading through AE Waite's "Book of Black Magic", if memory serves, and was immediately intrigued by the nature of the spirits therein. Working with them over the years is actually what inspired me to create planetary keys, etc., as the spirits themselves are what turned me onto the idea.
These are powerful entities, I find. Not ones to be trifled with, and provided you get on with them, they are plenty able to rearrange minor and major things within the known universe. Case in point, working with Ophiel to find a new home, some time ago, resulted in my being led to an apartment complex with a room for rent on the third floor, in the third building, near third street, within 3 days (if memory serves - bit hazy on if it was three days or three weeks). The locale was well within my price range and, little did I know until I moved in, I wouldn't be charged for electricity for nearly three years. I believe it was 2 years and 7 months before the management company audited their records and I was informed that there had been a mistake on their end that allowed me to get by without being tagged for an electric bill. I found that rather interesting, as while actually saving money was not the intention of the rite, staying within my price point was - and living in Arizona is quite costly on that front. In fact, during the summer months, one's electric bill can easily be between five and six hundred dollars...and I was keeping my home at 76 degrees Fahrenheit at all times. This calculates out to me having saved ~15,000$ at roughly 4500$ a year, give or take. All in all, pretty damned impressive for a spirit that some have relegated to a stance of less importance on account of his not being a deity.
Ophiel has come to my aid, repeatedly, since that time. I've worked with him at least six times for housing-related concerns since then, at least thirty times for clients, and probably more than fifty times for other Mercury-related concerns. As a general rule, working with him has proven to be incredibly helpful in both the short and the long term. As such, I am of the mind that serious practice in Planetary Magic requires some familiarity with him.
So too is this the case with his brethren Och, Phaleg, Phul, Aratron, Bethor, and Hagith. Each has their effects and potency, and as such they are quite worthwhile.
My methods, in working with them, are simple. The best results I've gotten have required the least level of preparation on my part after having been initiated by them. Prior to my simpler approaches, the thing that really kicked my experiences with them into higher gear (after moving into the apartment mentioned above) was evoking the lot whilst intoxicated; while I wouldn't recommend it, the process led to some potent internal changes that afforded me the ability to work with them more easily. Prior to this change, I found that using three candles of an appropriate color, the appropriate planetary oil, a mix of frankincense and myrrh on a coal, and the spirit's sigil worked quite well.
After the initiatory experience, writing a short petition and lighting a candle for the spirit in question became more than enough to readily conjure them. The process became, for me, something of an offering and a prayer. That in mind, I mention this because working with spirits like this in a simple, unimpeded way seems to be of value.
With that in mind, I have endeavored to pen, for you, Attunement Sigils to unlock the Arbatel's potency for you prior to work with the lot. I would recommend proceeding slowly, doing one a week on the appropriate day, during the appropriate hour if you're not familiar with Ophiel et alia.
Each of these sigils is correlated with a Planetary energy, and thus with a specific day, Planetary Hour, and thus a spirit. You can use Lunarium to calculate planetary hours - be sure to change the location to where you live, as that is crucial.