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Last time I did it in late 2020, you basically had to wait for the platform to be announced, then rush to get on with enough time to work out where you were meant to put your bike. Then put it in to the tiny little rack. I'm not aware of any way of getting earlier access to the platform.
If you can do some homework before and work out which carriage you are likely to be aiming for, it reduces the stress levels a bit.
Also, think about what you'll do with your luggage while you are putting your bike on - leave on platform or carry with you, if not too many small bags to manage. You can leave things like frame bags on, but best to take most off as may well be in the way of other bikes / bits of train.
Good luck!
I've booked a train ride to Blackburn and back which is very exciting. I also made a reservation for my bike both ways. What is the procedure that one has to go through at Euston when boarding?