If I had one piece of advice for my younger self, it would be "Do it now." Read it now, learn it now, don't put it off. If you have any sort of dynamic life at all, then there will never be time to do it later and it only piles up.

Then again, that is probably good advice for my current self, as well. ;-)

More advice:

Look at what is needed and make sure that you'll meet it.

Always take five minutes to plan what you're going to do. Taking a moment to plan is essential to making sure you haven't missed something. On the other hand, if you take more than five minutes, you're probably getting to the point where you're planning instead of doing.