In the days where I was not as focused and know what I was doing from memory, I would always cast a protective circle around anything I did. Now, as long as I’m fairly assured I will not have anyone walking in or interrupting my casting/practice, then I do not cast a circle anymore especially if it’s not baneful, which I rarely if ever do. It’s up to you entirely, but there are tutorials here on it here at Spells8, you can also search under the spyglass 
@william19
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