Hey, Vivien. I've not yet read those two books, but I have worked with runes enough to hopefully pitch my two cents in, here. No matter whose ritual it is, I strongly contest that one would need to do exactly as another prescribes to bring the power and gifts of the runes into their life and needs. In today's age, we have very little hard knowledge of how, exactly, the runes were utilized way back when, and so anyone's rituals or instructions concerning them is, at best, based on what felt right to them. In my own experiences, the runes require little in the way of external trappings or demonstrations---the runes themselves are the power that they represent, and it's more a matter of a person familiarizing themselves well with the runes and their applications that will bring about their utility.
I haven't used runes in structured spellwork yet, but as an unemployed student running on very little means for quite some time, now, I found that Fehu was very applicable in my life. When I decided that I wanted to engage the rune and try and work with its energies, I remembered that a friend of mine had gifted me a set of wooden casting runes a few years prior, so I unpacked them all. Though I only intended on utilizing one of them at the time, it felt proper to honor each of them as a whole. I studied the Runic Poems and the meanings/lessons of each, and upon familiarizing myself with one, I cleansed and blooded it before moving on to study the next until they were all familiar and red with my offering.
To work with Fehu, I intone the rune, and I draw the rune on my person and on things related to my need for the rune (inside my wallet, candle sticks for drawing, coins for wishing-wells). I feel like voicing the sound of the rune is important, so I intone it regularly--on my walk to class, while showering, whenever. To me, it works. I have no income, and before I began working with Fehu, getting by was definitely a struggle. Since I began several months ago, I have noticed that I come across more windfall financially than I ever had, in the past. It's nothing particularly cushioning, but I don't have to skip meals, and I can go on about my day with some confidence that I'll be able to cover the payments that I really need to on time.