I'm particularly interested in developing my Ti just to see if it can be done, as I have heard that we should not try to develop shadow functions.
Jung did write that there can be a problem in over-using one's inferior function, but only if tries to uses it solely and dominantly, and ignores one's other functions.
Were you to do so, then your inferior would bring your subconscious with it, because you normally use your inferior subconsciously and so they are strongly attached to each other. Your subconscious would then dominate, and your conscious self would be suppressed. You'd identify completely with the focus of your inferior function. But you'd no longer have the conscious awareness that could enable you to do anything about it. So you'd have all the awareness of the problem, but perceive no way to do anything about it.
As long as you retain the order of normal usage for your type in your daily activities, there is no danger of this happening, and you are free to develop any function you so choose.
See, this is what I mean. I'm not able to take an article apart like that and decide whether it's useful or not.
Ti-doms don't know either. Knowing whether something is useful or not, is Te. So it sounds like what you really want to do, is to develop your inferior Te.
Introverted feelers spend a lot of time alone analyzing their feelings, or at least I do, so if I aspire to be more logical in my thought process, should I think about.....what? :/
Simple. Do with your thoughts, what you normally do with your Fi feelings. Start analysing your thoughts. When you want to develop your Ti, then when a thought comes into your head, do the following:
1) Write it own on a piece of paper. Then write down the following below it:
2) "Is it really true?"
3) "How do I know this?"
4) "Does this make sense with everything else I know?"
Then try to answer these questions.
Think of everything you know, no matter how inconsequential, that might highlight if the particular thought that wrote down at first, could be true or false, and write all of them down. If one thought leads to another conclusion, write that down as well. Eventually, you'll start developing lots of chains of thought, where each one will indicate if the original thought you started with, is true, or false, or it can't say one way or the other.
You'll probably need several pages very quickly, for that one thought.
Then when you get tired, simply end that process, relax, and then when another thought comes into your head, start the process all over again.
Over a few months, you'll get so used to doing this, that a lot of the things you used to write down, will come to you in your head so naturally, that instead of writing down 10 steps of thought, you'll only have to write down 1 or 2 steps, and the rest will be obvious.
Then you'll eventually feel like when you do use this process, you develop entire dissertations in your head, in less than 5 minutes.