You have what it takes!
With IVs, scary as it might be and frustrating, the more you do the better you get. I started my nursing and oncology career inpatient and barely had a chance to start IVs, most of our patients had central lines. I had huge anxiety about IVs when I transitioned to outpatient, but after a year or two became a "go to" to tough IVs. You are not born with it, it's all practice.:)
Do not worry about knowing all about chemotherapy. You will have orientation and likely some classroom training. But mostly, you will learn about various chemo regimens in infusion by giving them. You learn practical details, related to safety, administration and typical regimens for various types of cancer, not necessarily mechanisms of action, rationale for a regimen. In a very busy infusion clinic you just don't have time to dig.
Having now worked in both inpatient and outpatient, I recently took a role as a Nurse Navigator and NOW I am learning more of the big picture - how folks get diagnosed, how regimens are chosen, what patient's journey is like through treatment.
Each type of oncology nursing contributes a piece of the "puzzle" of your growing body of knowledge and understanding. Enjoy the transition!