Spiritual Attunement and Enlightenment

[Harry Dresden]

Are the Spiritual Attunement and Spiritual Enlightenment upgrades a sequence or can you purchase Enlightenment and just not be able to astrally project? I ask because Harry can physically enter the spirit world in the Dresden Files books, but he can't just send a projection. He has to physically enter the Nevernever. So, I was wondering if I'd have to buy Attunement before Enlightenment or if I can just save up the 2k to get only Enlightenment.

[Ganondorf]

That should be fine.