I agree with all the above.
Yes definitely 30 is big for a complete beginner... One can start as you say, and also 10 mintues morning and evening for instance. Very good precisions.
Also a practice wich relates with both Bardon's teachings and external applications is to drill the speed of "peaking" . What i mean by that is at the end of the day one wants to learn two main things from this kind of thing: the ability to manifest, and the ability to meditate. Magick and yoga. So, the goal of magick is not to perform long rituals for the sake of performing them, but rather induce fast, powerful, changes.
Thats why Bardon recommends to drill (some forms of)magick in short sets, for instance like in external sports, or like in bodybuilding or weightlifting. In bodybuilding and weightlifting, one focuses on maximum power and maximum anabolism(respectively) by practicing only short sets, from 1 to 10 repetitions. This works in magick and here for our practice. One can drill the ability of reaching maximum sensations in less than 10 seconds, then in less than 5, then in less than 3, then instantly. You can do a session of 1 hour consisting of say 150 very short sets.
Each type of practice is optimal for its specific results. Also for health a big factor is balance. One too "yin" will benefit from "yang" stuff, and vice versa. For external and especially martial application one must apply the above to actual combat, weightlifting, full speed and full power, against a resisting partner. One should get the performance to a similar level of professional athletes if done well. Also ground work is very good to enhance mastery, first hatha yoga like(static), then moving, like in brazilian jiu jitsu(fighting on the ground). Dynamic work on the ground againts resistance with all the above in mind will skyrocket dantien awareness and power of manifestation.
Weapons are very helpful too ! A flexible chinese sword(jian) is very good as it combines the yin and the yang in an easy percievable way. The tip of it moves and is very sharp, tiny, always be aware of it. At the same time the handle is big and rigid. It is like two weapons in one, and the to extremes move at the same time. Be aware of the weapon from top to bottom and just like the physical body, in 6 directions, with a center of gravity, two extremes and the yin and the yang working always. The weapon can be drilled too in several ways. Then see how magick rituals are enhanced after such practice.
A very good thing with weapons(especially sword) is rythm. In martial application (free fencing) it is awesome to feel the different rythms always there in potential, and several manifesting at the same time. It becomes a mind game, very close to magick. Then translate this to meditation(rising on the planes, tarot reading, whatever...) and empty hand martial work(very good for precision and timing).