If this is your first channelling experience, I would say an intention or prayer something like this, out to ‘whoever/whatever’ you believe protects you when you don’t feel safe:

“Whoever these Guides are, I am new to this. I am new even to the concept that I have an Essence connection.  I have fear.  I am not at all interested in these Guides ‘connecting’ with me if it makes me feel unsafe. I am only looking for positive, loving, peaceful experiences here.  My boundaries are that I am only willing to connect with these Guides and their teachings if they truly are for my highest good, and if this information is for my highest good.  And if they are not, or this information is not, I will have a deep knowing come forth from within myself (even if this is the first time I have experienced it) to tell me that this site, these guides, this information, is not for me. At all times, I want to be safe.”

You can of course make up your own wording but the point is, you should always feel that you are in control of your experience.  The Guides have taught me this since the beginning. Anyone who tells you that you should ‘just trust’ is working from a religious dogma perspective, a perspective where you must ‘prove yourself in blind faith that you believe’.

My Guides have never been this way. They have always been respectful about my needs to test them, to ask for proof, to really be cynical.  And though this did mean it took longer for me to ‘come out of the closet’ as a channel, I can now say that to the best of my knowledge and from the experiences I have had personally as well as witnessing the multitude of experiences of my clients that the Guides are honoring, loving, they come from Source, and they are safe.

However I feel that you need to figure this out for yourself so by all means, create all of the boundaries you need. I won’t be insulted. I will feel that this is your own part in empowering yourself to not give your power away to anyone or anything, including Spirit.  In fact, I would say, “good for you”.  Consider this your first lesson from Source Within on empowerment.  ;)  

You can use the above paragraph as a protective technique when you consider any new resource, not just us.  You're welcome!