An effort to preheat the engine the engine will be well worth it both in easy, safe starting, and long term engine life. Just think of your really expensive crankshaft, camshaft and lifters running with little or no lubrication for the first 30 seconds, while that thick oil is being warmed up enough to flow to where it is needed. If you have any doubt, watch how much longer it takes to get an oil pressure indication after a very cold start. That's how long the engine is running with very little lubrication.
It's easy to get the engine running and be so pleased with yourself, that the damage just done to the engine is forgotten - until "making metal" time.
If you just have to fly, with the aforementioned care around propellers considered, prime it and pull in through 5 to 10 times, and then prime and repeat, prime and repeat, until you've pulled it through 30 to 50 times. If you still want to go flying after that, it should start fairly easily. The oil will have started to warm a little and flow, and the priming will have introduced a little bit of oil dilution into the cylinders to reduce the friction and stiffness. This has worked for me numerous times in the cold Canadian winters.
Cheers, Pilot DAR