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It's a friendly environment, starting at the back means you'll either learn to accelerate through the people ahead of you when there's no space for a bike to go through (people will tell you it's all about the first corner and it is. for those who are gridded) or you do something else.
Starting at the back means accepting you're going to be delayed at inevitable constipation point of the first corner or obstacle that requires slowing down for. Your race is then about "when do I say "enough!"?" and attempt to get away from all the other people clawing at you and holding you back from your dream of a top 30 finish on a muddy field somewhere in England. Before getting lapped just before you start your penultimate lap and your race is ended and you're £25 down.
Newb question. What's the required standard for starting out cross racing? This might be hard to define. I'm interested, not particularly fit right now. Mid forties. Could I just rock up and race?