So, new nurse? new program? New patient?
1) Is this therapy appropriate for this patient? Are they brand new to dialysis? Is this access "temporary"? What type of therapy are you offering? Daily home hemo, noctornal etc?
2) What is the MD's input? Do you have a rapport with the Doc? Exercise your influence.
3) Plan a "team" meeting and VOICE your concerns.
4) Research and read, how have others met/mastered or had issues with this particular problem.
As a seasoned nephrology RN, I do not necessarily think a nurse has to be with the patient doing home hemo via catheter, but I do think you need address the above items and assure your confidence (Do whatever it takes

) and the patients competance.
Good luck!