Hi MotherofRose,
I am not sure if you still need support but I am currently re-using pu/pd with my now 11.5 months old daughter. I had similar problems, no routine at the beginning and I stumbled across Tracy's books when I was desperately looking for a solution when my DD was 9 months and could only fall asleep at the breast (unfortunately Tracy's books are not well known in the German speaking area and most currrent books are very focused on attacement parenting....needless to say I am recommending Tracy's books to all my pregnant friends so they can avoid our problems).
We had a pretty hellish first week (more for me than for her, she is a spirited baby and I think she didn't mind the long pu/pd time at the beginning... me I was pretty exhausted) and the 2 really good weeks. We then got 6 teeths in a row which was a nightmare for all of us, then a bad cold before Christmas and unfortunately I didnt stick to it and some accidental parenting crept back in. I have started to use it again und luckily I am already seeing good results and will definitely stick to it now!
I would advise you to use the age appropriate solution, that worked well for us (then and now). It is easier to calm her in the crib then picking her up all the time (which, in our case, would also wind her up even more due to her spiritied nature... not to mention my poor back could not take it I think...), so as recommended it would mostly only use the "put down" part.
Also, before she used to sleep in our bed so she had to get used to the cot. She would cry when I put her down, basically after the first day, which involved a lot of pu, she wouldn't cry anymore when I put her down. After that I mosly used the pd part, and only pick her up when she is really frantic.
I can only recommend to stick it out, it really is worth it!
Hope that helps!
Good luck and all the best!