I did this when I was pg with DS #1 as I was TOTALLY terrified of tearing & guess what??? IT WORKS!!! I basically did the same thing, I used a lubricant though & just applied some pressure with fingers & thumb & YES do it sitting up, much more manageable. Jessica's head was only 32cm which I believe is quite small but the m/w also massaged Jessica head out to help prevent tears. As embarrassing as it is, it was well worth it for me.

Cheers!!

Jayne xox