Anyone who knows their path has already achieved a lot. A healthy lifestyle and time spent wisely are good companions. You never finish learning throughout your life. If you internalize this, personal habits can, in the best case scenario, also benefit others.
While a lot of us may prefer to take our time refining our skills and preparing for a new challenge, sometimes it doesn’t work out that way and you end up instead being “thrown in the deep end”. This expression captures the sense of intimidation and trepidation which can be felt in such situations. All the same, “being thrown in the deep end” may also prove to be a good learning opportunity. After all, when placed in such situations, sometimes you either “sink or swim”, giving you a strong motivation to conquer the challenge.
So you can certainly specialize, but not without making sure to divert your focus to other areas from time to time in order to acquire broader knowledge and benefit from advantages, i.e. “the best of both worlds”.