Should I create Class Diagrams before Sequence Diagrams because of Design Patterns?

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UML

patterns

Good morning,

I'm in the inception phase with a project and I have an existential doubt that I didn't realize before. Maybe because this is my first serious project.

According what I learnt in the past at the university about UML... the artefacts are normally created in the order shown:

1. Use Case Diagrams
2. Sequence Diagrams
3. Collaboration Diagrams
4. Design Class Diagram

The thing is, I've been deeping into UML design patterns and I know I want to use 3 or 4 of them that suits me perfectly in my app. They have a fix class diagram schema and how the different classes are linked between them. Sequence and collaboration diagrams are created prior to Design Class diagram. What I understand about a Sequence diagram or collaboration diagram is the idea that you should be comfortable with the solution applied but I feel I am not comfortable creating those diagrams before to do the Design class Diagram. Must I force the Sequence & collaboration diagrams to be using the classes required by the pattern itself? That's no natural to me. Should I create firstable Class Diagram?

Thank you very much.