Is it difficult to get in without a tour? I just walked in 60. Years ago but now?
The Basilica is free but expect long lines
You can book an entrance with audio that gets you in a bit quicker
Be sure you are booking on the official site
https://www.basilicasanpietro.va/en
The longest line is the Security Checkpoint line. Once through there you are pretty clear with no waiting.
Reserve an entry time on their website!