Hi!
First off, my apologies for taking so long to answer you. I had not seen your post until today.
Then, I think I'm gonna need more info to come up with a plan, cause your lo's 450 am waking can be due to many things such as overtiredness or a need of tweaking of schedule. 13 months is such a tough age (it's exactly when i adquired all my sleep training expertise LOL). Molars can disrupt any routine and sleep training method. IF lo's teething badly i'd suggest to hold off sleep training for a couple of weeks, cause in the middle of pain and discomfort, it can be misunderstood as a failure in the techinque and you can read him wrong because of all the upsetting.
Then if you try w2s you should go around 30-45 mins (although an hour is a good mark, but i have found with toddlers that the closer you go to their waking mark, the more chances you have to succeed... it's up to you). You have to just unsettle him (not waking fully) just enough for him to go back to sleep again (quick rubbin' or tickling or moving him gently), just enough for him to start a new sleep cycle. IF you wake him at all you might have trouble making him go back to sleep.
For other wakings it's ok to use wi/wo, only if you feel comfortable with it. All sleep training techniques are described thoroughly in the FAQ section at the top of this board, under a thread called Teaching Independent Sleep. Under that section, there's another thread called Most Common Sleep BUsters where you can find possible reasons for a toddler's wakings. Have a read at it and see if something rings the bell in your case. If so, post your schedule so we can come up with a plan.
Good luck and keep us posted!