how can i repot my passionflower?

I bought a passionflower at the store and it was climbing to a kinda small sircle formed espalier, (similar to the pic above)
But the passion flower is growing so fast and I guess it needs to be repotted with a bigger espalier.. anyone know how can I do that without harming the plant? (the leaves are so fragile)
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Passion flowers can grow big and I'm sure yours would prefer to be in the ground rather than in a pot. If that isn't possible then use John Innes No 3 in the bigger pot and train the plant up a trellis or some wires. The advice on the RHS site is always sound and this covers climbers and the training thereof. https://www.rhs.org.uk/advice/profile?PID=463