Reference for Berakhot 5:4

הָעוֹבֵר לִפְנֵי הַתֵּיבָה, לֹא יַעֲנֶה אַחַר הַכֹּהֲנִים אָמֵן, מִפְּנֵי הַטֵּרוּף. וְאִם אֵין שָׁם כֹּהֵן אֶלָּא הוּא, לֹא יִשָּׂא אֶת כַּפָּיו. וְאִם הַבְטָחָתוֹ שֶׁהוּא נוֹשֵׂא אֶת כַּפָּיו וְחוֹזֵר לִתְפִלָּתוֹ, רַשַּׁאי:

The prayer leader should not answer Amen after the Cohanim [at the end of each blessing, as the rest of the congregation do] because of teruf (confusion) [lest he become confused and err. For the prayer leader must begin the next blessing and recite it to them word by word, and if he answered Amen, he could not concentrate and return to the prayer quickly enough and begin the next blessing.] And if there is no other Cohein but he (the prayer leader), he should not recite the priestly blessing [lest he not be able to concentrate and return to his prayer to begin "Sim shalom," being distracted by "awe of the congregation."] Ve'im havtachato [that is, if he is confident (batuach) that he will not be distracted by "awe of the congregation"], he is permitted to do so.

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