I tried to create a tulpa, but I did not succeed. I remember closing my eyes, trying to "visualize" my tulpa in the space in front of me, but I couldn't seem to do it. I have a hard time picturing things in my mind in general, so I might be a poor candidate for tulpa creation.
However, I didn't put nearly as much effort into it as I could have. I spent only a few hours a day, for a couple weeks, before giving up. Reputedly, it can take months to see any development, though I don't know how much truth there is to that. Also, even among the most dedicated tulpa creators, few or none create a tulpa which feels as if it is its own being, i.e., "imposed". So, you likely need certain traits to create any tupla, let alone one that interacts with you and your surroundings, and is overlayed on your perception of externality.
In retrospect, I don't think it was that good of an idea. Assuming I did succeed, there were both the possibility that my tulpa wouldn't like me, and that I wouldn't like my tulpa. Those situations would have been nightmarish, because getting rid of a tulpa is, reputedly, just as difficult as creating one. I would not want to be stuck with a mind nested inside my own.