A childless aunt of mine had prepaid hers with a local firm, not one of the big operators - and stipulated what she wanted - all very simple. We were very grateful that it spared us both hassle and wondering what she would have wanted.
I don't think the cost included printed service pamphlets, but we had some done anyway.
My mother hadn't made any arrangements for hers, and had had advanced dementia for ages before she died, so no hope of discussing it, but we knew roughly what she'd have wanted. However, we had to delay her funeral for over 3 weeks because less than a week after her death the entire family was going to be in France for a family wedding, and we were all making a holiday of it.
This was not a problem, but occurs to me that plans might not take any such necessary costs of 'storage' into account.
I did hate the thought of leaving my mother in cold storage all that time while we were all away, though. I know she wouldn't have minded in the least in the circs, but still...