Let me first say that I love Tamiya kits. I almost exclusively build Tamiya. They are the best in the business. But, it drives me nuts when people say " just add glue and paint to the box and shake". As great as Tamiya kits are, there is plenty of things that can be done to improve them. Tamiya could take a page or two out of Accurate Miniatures play book as far as cockpits go. For the money they get they could provide better detail. Molded in flight controls also drive me nuts. Either remove and reinstall them, or at least open up the area between the flight controls on the sides. Same goes for the trim tabs, control horns and cowl flaps. Why do we continue to get stuck with molded on tail wheels too? Tamiya is getting better with each new kit they turn out.
Sorry I got way off topic on that one
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To answer your question...no, its's not to tough of a kit. They go together easily. If you feel that you need filler for a seam, stop and see whats wrong. Tamiya almost never needs filler. They are straight forward kits that are relatively easy to assemble. Out of the box will give you a good looking kit, but there is still room for self expression if you are so inclined.
Darren