Yes, I think so.

The job of the therapist is to use yourself as an instrument, and be aware of how you ( your instrument) reacts. If you feel angry, irritated or bored with a client, very likely other people would also. So you use the information you’ve received, by your own reaction, in some manner that would be helpful to the client. The trick here is note your feelings to yourself, think about why the client is probably acting the way he is, and not express them as they are felt, for example – not speak angrily. The therapist’s job is to find a way to explain to the the client, so he can understand, how he is creating this reaction in another person without sounding critical. Then it’s the therapist’s job to help the client understand what is going on within himself.

Similarly, if, as therapist, you are “tiring” of your client, or getting bored, it is a signal (to me anyway) that the client is not being authentic, or is not going anywhere useful, i.e. being repetitive. This too can be communicated to the client without judgement and in a clarifying way to help the client in self awareness.

This takes skill, more than simple self control, because you as therapist have to know how to reach that particular client.

What you say may be experienced by the client as a confrontation but one that includes having the therapist’s arm around you, metaphorically.