I'm assuming that you've got a start on singing while playing. It's more than I have so take/reject my advice accordingly;
As a lapsed chorister I'd suggest that you do the repetition thing but only up to the point of reading through twice for each song during a session. Too many repetitions in one go can slow you to the point of wanting to give up. If you can, try to do the whole set in one session at the earliest opportunity. It's hateful to think that after doing the work there are yet more songs to tick off the list.
Make personal associations in your mind with the lyrics so that you have more of a connection to them. For instance, if you are learning Mustang Sally, picture a horse but with the head of anyone you know called Sally on it. The more silly the association, the more memorable it is.
From memory, copy the first line of each song, in hand-writing, onto a piece of low-tech paper. The act of hand-writing the first line (or two or three if needed) made a more lasting imprint on my memory. The sheet used to go in my pocket. It was good to know that it was there, like the key to a lock, any time I needed it. It only got used a few times.
You'll be fine but good luck anyway.
How many songs have you got to learn and when do you aim to perform them?
Is this an indication that there may be a hiatus in the compilation of material for the Hitch-Hikers Guide to the Kebabery?
Do little Smugs get fed-up with being felt all of the time?