An alternative opinion to the good advice above but ,i had the same problem when i purchased my drysuit after two minutes of wearing my eyes and viens started to bulge and if felt bad.My LDS said trim it or stretch it.
I chose to stretch and if that did not work i would trim after.I put talc all over the seal and slipped (with effort) over the end of a 4 pint beer pitcher and left for 2 days.After that it was better but still a little tight so i repeated and left for 3 days and now it is spot on but how much give was needed to make ok i can not say.For me i was worried about taking to much off or after taking a little off and fitting ok it stretched.
Just my 2p
Regards,
MAL
PS The beer pitcher was empty
I chose to stretch and if that did not work i would trim after.I put talc all over the seal and slipped (with effort) over the end of a 4 pint beer pitcher and left for 2 days.After that it was better but still a little tight so i repeated and left for 3 days and now it is spot on but how much give was needed to make ok i can not say.For me i was worried about taking to much off or after taking a little off and fitting ok it stretched.
Just my 2p
Regards,
MAL
PS The beer pitcher was empty