Depends… where did you get the… oh liber spirituum? 
I think it’s probably good. I have not worked with that grimoire to give personal experience, sorry. I would personally go at it without reservation though. 
I see the well known entities Paimon and Amaymon in there… that gives a good opportunity to test these. Call them using the common sigils we all know, then banish and call again with these and see what the difference is, if any. Ask them if they’re good sigils.
If that’s good, it gives a certain confidence in the others, and i’s all good practice. 
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I call the Plut manuscript the Florentine leadership. 89, Sup. 38 from the Medici Laurentian Library, a collection of treatises and fragments on magic, closely related to the Munich leadership.
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