I am not sure if you have had your questions answered, so let me give it a shot.
[Actually, I’m probably more confused now than when I asked the initial questions.]
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If I were you, I would purchase the Shorter Christian Prayer; I believe there is a guide for using it (I know there is a guide for the larger one volume Christian Prayer and for the 4 volume set).
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[Actually, I have this and have been using it a few years now, though I still am unclear if I’m doing it correctly.]
*If you can find it in your schedule, try to say Lauds before going to work - about 15 minutes of time - and Vespers after work. Do not worry about exactly what time you say them; it is prayer, and while officially they have certain time slots, the issue is praying, not fitting your day into a time slot that is impossible.
If you can add to that, Compline, or Night Prayer is a great way to end the day.*
It can be helpful (and what I miss most) to say it “in community”; that is with others - one or more. Not critical, but it is a community prayer.
**[Well, I don’t have a community per se. I don’t see my friends often, or anybody else for that matter, and the people at church are just strangers.]
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After you have become comfortable with saying it, and regular, you can branch out to either the 1 volume set, or look into other variations. The most important part is learning how to say it, and learning to do so regularly. It is pointless to spend a lot of money on something that becomes more confusing than what you already have. That is much more likely to lead to not saying it at all, and that, rapidly. Frustration has a tendency to cause most people to find something they can accomplish, rather than continue to persue something they can’t.
*For all the criticism of the current translation, let me put it in plain
English: praying the current translation is a lot better spiritually than not praying it at all.
And unless you are very good at Latin, I simply would not go there at all at this time.
God is not going to get mad at you if you are doing your very best; if you don’t get everything exactly in its place, He isn’t going to zap you. Learning takes time; when you are doing it on your own, it takes more time. Worry less about getting it exactly right, and spend more time reflecting on what you are reading. You will do fine.*