I am not sure whether the north exposure will work for it, but you definitely can transplant it now. I just transplanted 3 Clematis last weekend and they feel great. The weather is not hot yet, some rains are expected.
Usually, red Clematis need some direct sun. I hope our experts will comment on this.

Don't really think you have given the clematis time to get going Pat. The clematis you got from Debbie was one that was growing in a pot and was probably setting in mostly full sun. It was fine all last summer and was planted in the ground last fall. The plant then had to get acclimated to its surroundings, its new home, and growing in indirect light. It is probably just getting its root system going. I have several that I planted last fall that are up but still not going great guns.

I have Duchess of Albany planted on the north side of my house and it has not fazed it one bit. The plant will get bright indirect light in the early spring and as the sun gets higher in the sun should get some direct sun later in the season. I realize that you are further north than I am so that means that the sun may not get as high in the sky as it does for me so you know better than I how much sun it is actually going to get in the position it is in now. I agree that transplanting it now shouldn't be an issue for you in your zone. Then again you could see how it does over the course of this season and then move it this fall if it fails to perform as well as you expected.

Alina, hadn't ever heard that about red clematis. Can you remember where you heard about them needing some direct sun? My garden is mostly sunny so I have not really had to worry about my reds getting enough sun. Normally I am having to look for some respite from the summer sun! LOL

Ah, the solace of other people's experience. I shall be patient. But it's good to know I have options if it really doesn't take to this spot. I put two on my north wall last fall, too, but they're doing marginally better --and, with them, I don't have the pressure of making sure my gift to my sister doesn't fail!

Thank you both for your input.

I've read it on one of the vendors' web site. Something like: brightly colored (purple and red) varieties need more sun than pale varieties. I'll try to find this article.

Cool Alina. Would love to know the source. I am wondering if they meant to say that the darker colors hold up better in the sun whereas the paler ones tend to fade out in full sun?

You are absolutely right as always. They only mention that pastel colored ones fade in the sun, so I made a note to myself to plant my pale pink, blue, and bi-color Clematis in the dappled shade. Sorry for misleading :(
In fact, I found this article which says that Flowers of some red and blue large-flowered hybrids and the bicolors fade badly if they get too much sun . I wonder what is too much in this case. It also says that most of Clematis need 6+ of direct sun though. This discussion is very useful for me because I am planning a couple of new bed around a gazebo we are going to install. One side will be almost completely shaded, with some early morning sun.
So, you think red Viticella will do well in such location? What about type 2 ('Rosemoor')? I would love to interplant my pastel Clematis with some brightly colored ones.

No problem Alina. We all get confused sometimes--like my forgetting to post the picture of Sunset in my latest thread and actually have a picture of Blue Light.

Don't grow too many large flowering hybrids which are red so can't help you there. Sunset is one that I do have and it doesn't fade in the sun. What is too much sun is just too subjective to be used in an article on any plant. What is too much down south might not be further north.

I don't think many clematis are going to do well in an almost completely shady area. Not sure how much some early morning sun means either. No one will be able to tell you absolutely how anything will do in that location so trial and error will be the best bet.