OCD buying in

Curious to hear from other therapists how you might work with clients who are maybe struggling to buy into ocd treatment even if they understand they have ocd and do understand purpose of treatment (specifically erp). I understand how difficult it can be for clients to allow uncertainty and anxiety to be present but I also know that for many clients with ocd, they themselves are frustrated and may take that out on the therapist as well for suggesting small exposures or asking questions that involve uncertainty or explore what it’s like to not know the answers. How do you personally handle these situations gently with clients? Any personal tips helpful for you as clinicians? I know sometimes I need to slow down in my expectations as well!