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It is a Mitzvah to cut one’s nails on Erev Rosh Hashanah in honor of Yom Tov, just as is the law on Erev Shabbos. [One is to cut his nails prior to immersing.[2]]
Bathing on Erev Rosh Hashanah:[3]
It is a Mitzvah to bathe one’s body in hot water on Erev Rosh Hashanah in honor of Yom Tov.
[1] Tur 581 from Midrash; Yerushalmi; Tanya; Elya Raba 581/37; Kaf Hachaim 581/81; Admur 529/2 regarding every Erev Yom Tov; 529/5 that this Mitzvah applies likewise on Erev Rosh Hashanah; Not brought in Michaber 581/4 together with the Mitzvah to get a haircut and wear clean clothing.
[2] See Kaf Hachaim 260/1 and Mateh Efraim 625/13; Shlah 138 that the nails are to be cut prior to Mikveh.
[3] Tur 581; Admur 529/2 regarding every Erev Yom Tov; 529/5 that this Mitzvah applies likewise on Erev Rosh Hashanah; Not brought in Michaber 581/4 together with the Mitzvah to get a haircut and wear clean clothing.