Depending on the harshness of the winter, I do mine any time from late Feb to mid March, cutting them back to about 9 inches and then give them a generous dollop of clematis food and aliquid tonic of tomato food. Here's the RHS advice - https://www.rhs.org.uk/advice/profile?PID=347
If you planted your Summer flowering clematis correctly you would have planted them about 6 inches deeper than they were in the pot.
Then in February you would chop them right down to the floor, to encourage new stems from below ground.
Not now as you may just end up disturbing and weakening the roots they have. They go deep and are fleshy so easy to damage. Give the plant a jolly good mulch of 3 to 4 inches of well rotted garden compost every spring to compensate for not planting them deeply. Prune and feed as above before mulching.
In my experience, clematis can take a season or two to settle and get their roots down and then they'll take off producing more stems from the base every year. If you mulch them in autumn when the upper growth has lost all its foliage and turned twiggy you don't have to worry about not mulching the old stems. They'll be cut off in spring anyway and the new stems will come from the root as long as you get the feeding right. Greedy plants, clematis..
Personally, I would get the fork under them and lift them, making sure to get the whole rootball, then dig the hole deeper and replant, then give them a real good soak.
Do you know which 2 cultivars they are ?
I always give my clematis, group 2 and 3, a Valentine chop. Nothing much else to do on the 14th! I wouldn't dig up the clematis now you've planted it. See how it goes first. They are not that fussy and a mulch will definitely help.
Obelixx - I agree clematis take a year to settle down.