When trying to match difficult seams I use glue stick on both of the seams and finger press them together. Works like a charm, they stay put so I can pin them on each side of the seam.
I use a nut pick as a stiletto, it is cheaper (you can get them at the $ store) and they are not sharp.
I use a coffee cup to hold my glue upside down so I always glue at the top & ready to use.