Father versus hired Mohel:[1]

The positive command is specifically on the father to personally circumcise his son.[2] Nonetheless, in the event that he does not know how to do the circumcision, then he is to appoint another individual to do so on his behalf.[3]

Appointing a Mohel if the father knows how to circumcise:[4] Some Poskim[5] rule that if the father knows how to do a circumcision and is able to do so, then he must personally circumcise his son and is not allowed to delegate the Mitzvah to another Mohel. However, most Poskim[6] rule that he may choose to delegate the Mitzvah to another Mohel even in such a case that he is able to do the circumcision himself. According to all opinions, one may hire a more expertise Mohel rather than do so himself.[7]

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[1] See Pesakim Uteshuvos 260:1; See Encyclopedia Talmudit Vol. 46 Erech Mila p. 406-409 footnotes 65-80

[2] Michaber Y.D. 260:1; Kiddushin 29a; Shevach Habris 7:1; See Likkutei Sichos Vol. 30 Parshas Lech Licha 3^rd Sicha

[3] Rama 261:1; Chochmas Adam 149:1; Misgeres Hashulchan 163:1

[4] See Chochmas Adam Binas Adam 7; Bris Avos 1:10; Otzer Habris 3:3; Shevach Habris 7:1 footnote 3; Poskim in Pesakim Uteshuvos 260:1 footnote 2; See Encyclopedia Talmudit Vol. 46 Erech Mila p. 405-408

[5] Possible implication of Michaber 260:1 and Rama 261:1;Shach C.M. 382:4;  Darkei Moshe 264:1; Derisha 261:1 in name of Or Zarua Mila 107; Gilyon Maharsha 260; Ketzos Hachoshen ibid

[6] Tevuos Shur 28:14; Pleisi 28:3; Chasam Sofer O.C. 159; Poskim in Pesakim Uteshuvos 260:1 footnote 4

[7] Aruch Hashulchan 261:5; Maharam Shick Y.D. 239