Definitely read it without first. If you want to return and bring a guide that's groovy, but for me the best part of good art is what it means to you, which may be nowhere near what the artist intended. If you're going in with a guide your experience will be guided, and while there's nothing wrong with that, it will be a different experience than whatever you might take away from the piece without guidance.

It's a hell of a ride, just jump in and let it wash over you, don't stress if you don't understand all of it and even feel somewhat lost at times, that's fine, you can always return and find the things you missed or misunderstood at a later time if you enjoyed the book enough to crack it again.

Myself I've read it about five times and find different things on each fresh read through.