Do you still have your flat bar bike?
Start by comparing positions, using a metre stick and plumb lines. Saddle needs to be in exactly the same on both bikes, relative to the bottom bracket. Then the handle bars, relative to the saddle should be roughly the same to the part of the bars that you plan to hold for most of your riding. If there are some large variances then I would look to see where changes are needed. For the majority of riders, the most comfortable position is holding on the "tops" usually the brake hoods.
To master the new position and brakes & gear levers etc, investment in a basic turbo trainer could be the solution, I usually experiment with minor changes on my turbo and also following an accident which left me a bit nervous on the open road for a while.
Start by comparing positions, using a metre stick and plumb lines. Saddle needs to be in exactly the same on both bikes, relative to the bottom bracket. Then the handle bars, relative to the saddle should be roughly the same to the part of the bars that you plan to hold for most of your riding. If there are some large variances then I would look to see where changes are needed. For the majority of riders, the most comfortable position is holding on the "tops" usually the brake hoods.
To master the new position and brakes & gear levers etc, investment in a basic turbo trainer could be the solution, I usually experiment with minor changes on my turbo and also following an accident which left me a bit nervous on the open road for a while.