CIRCLE TIP:
I know books from the seventies would have you believe otherwise, but you don't have to mentally hold circle for the whole ritual, and you don't have to physically mark the whole circle boundary, nor do you need a coven member to hold space. You can put regular old rocks at each of the cardinal directions along the walls of your room or along the outer perimeter of the sacred space and use those as anchor points for the energy you lay.
Start by gathering, cleansing, and sanctifying/consecrating/blessing/charging/whatever four stones of any shape and size that suits your needs. Larger stones are good if you want them to be a visible reminder of the boundaries of circle, but smaller ones are good for discretion. Anoint them with a protection oil if you'd like (I only recommend doing this if you are using them indoors with no animals around), and/or pencil protection sigils on them. Cast circle but make sure your energy hits each stone and runs through it. If you call in the quarters, invite them to reside in their respective directional stones. Boom, done, now you have an easily marked sacred space that doesn't need constant maintain.
And, fun fact, circle doesn't HAVE to be round. Round is easiest when you're using mental energy to hold the space, but if you use physical barriers like existing walls then your cast energy resides in that physical block and is held automatically. I especially love doing this as a quasi-permanent marker to sanctify an entire room because any doorways become defacto entrances/exits that spiritually open and close when physically opened and closed.
Okay but isn't this being lazy? NO you rude hypothetical, it's not. It's being resourceful. Using these physical anchors allows a solitary practitioner to put their focus towards other things. I use this method when I'm studying magic texts, or so I can hang out with my ancestors and spirit friends casually for extended periods of time, or if I am going to be attempting astral projection. And by "I use this method," I mean it is one of the permanent protections I have in place in my home.
Has anyone else tried this? Please share any experiences or circle hacks you might have!