Do you have a powerful gaming pc with an nvidia GPU?

If NO: > Use elevenlabs.io and suck it up, or search for other similar products. Celebrity voices are banned now though so, idk what you do.

If YES: > You have access to local offline services, which typically offer more freedom at the expense of some technical expertise being required in setting them up.

...

Do you want to record yourself speaking and then convert that audio into another voice?

You want to use RVC. P3tro has the best tutorial for this: https://www.youtube.com/watch?v=qZ12-Vm2ryc&ab_channel=p3tro

...

Do you want to do "text to speech"?

Do you want it to be fast? Use CoquiTTS or StyleTTS2 - I would recommend first installing Pinokio and using whatever they have available, since it's good to test things. Go for a proper github install if you figure out why you should. https://pinokio.computer/

Do you want it to be good? Use TortoiseTTS - I would recommend spending a few hours watching the latest videos in this channel. https://www.youtube.com/@Jarods_Journey

...

Other things of note.

You need clean audio of the person you want to replicate. Podcasts and audiobooks are great! Speeches where it keeps swapping between the interviewer and interviewee, and where there is background noise like clapping, really suck an are not worth your time to deal with.

UVR5, ultimate vocal remover 5, is incredible at separating instrumental from vocal - use this as the basis of any song covers you may wish to do.

...

Video lipsync

I recommend easywav2lip or face fusion

...

Final note:

I haven't been playing with this recently. Do your own searching as there may well be 'portable' installs of things that have been released. A great example is 'easywav2lip' or also 'face fusion' as packages that are really easy to install and use, compared to the code they're based on. If you find anything you think is awesome and helpful, be awesome and share it as a reply to this comment! Help me, help you.