Just a Reply here but unless you are new to the whole scene of weight lifting it is very diffucult to gain muscle and lose weight.

In order to gain (build) muscle you need a surplus of calories

In order to lose fat you need a defcit of calories

It can be done but its a very slow and hard process your better off spliting it into phases so instead of losing 5lbs and gaing a pound of muscle in 3months your better off gaining 4-5lbs of muscle in 3 months and then losing 5-10lbs in 3 months.

Many people over estimate the amount of muscle they actually gain. Hard-core body builders put on a 1-2lbs of muscles a month.

But like a said agian if your new to all this changes will come quickly.