I'd recommend using oremo as well it's much easier for you in the end
Learning how to use OREMO is an especially good idea if you plan to make more voicebanks in the future. It makes the entire process a lot more efficient. But if you only intend to make just this one, you can still feel free to use something like Audacity if that's easier for you. Either way, ensure that you have adequate silent space at the beginning of every CV recording, to avoid accidentally removing any consonants and so you have enough space to make a good OTO.
I also recommend looking at some otoing tutorials, they really heko
More specifically, here's a particular guide you can read:
https://utaforum.net/resources/cv-otoing-guide.269/
Although it doesn't cover SetParam, there is an in-depth explanation of the default OTOing windows on both Mac and Windows.