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As mentioned in:
https://www.southampton.ac.uk/~wright/1001/Notes.pdf
Section 9.4
I’ve written a program that uses all the different techniques used in that chapter, however specific to Vigenere ciphers I use the ASINTOER frequency analysis method – running the program prints to the terminal a table of 26 columns and lots of rows (n rows for each keyword length of n).
Although it isn’t guaranteed to work every time, usually you can just read off the letters that make up the keyword and if it makes sense then it is probably correct, then you just need to edit a program to decode the text using the keyword.