Answer: Since your tree is indoors in a controlled environment, transplanting now should not affect it in an adverse manner. Just make the transfer as quickly as possible into pre-moistened potting soil and be sure to water well after the move to help settle the soil and drive out any air pockets around the roots. Insects generally transfer pollen from one flower to another. Since your tree is indoors, you can either transfer pollen with an artist's paintbrush (visit each open flower as an insect might do), or you can sharply tap each flowering branch to help the ripe pollen drop from the male to the female parts of the flower.
Enjoy your lemons!
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