can you do exercise 1 and exercise 2 at the same time?

Exercise 1:

44.. Now make the application: Select a room where you can be alone and undisturbed; sit erect, comfortably, but do not lounge; let your thoughts roam where they will but be perfectly still for from fifteen minutes to half an hour; continue this for three or four days or for a week until you secure full control of your physical being.

Exercise 2:

29.. Last week I gave you an exercise for the purpose of securing control of the physical body; if you have accomplished this you are ready to advance. This time you will begin to control your thought. Always take the same room, the same chair, and the same position, if possible.

In some cases it is not convenient to take the same room, in this case simply make the best use of such conditions as may be available. Now be perfectly still as before, but inhibit all thought; this will give you control over all thoughts of care, worry and fear, and will enable you to entertain only the kind of thoughts you desire. Continue this exercise until you gain complete mastery.