Treasury Secretary Nicholas Brady, seeking to ease concern in financial circles that President-elect George Bush will have difficulty dealing with the burgeoning federal budget deficit, said Friday he is "confident things will work out just fine. I think this is overblown and entirely too quick a summary of the situation," Brady, who has been asked by Bush to stay on in his present position, said on NBC-TV's "Today" program. Viewed as indications of a lack of confidence that Bush can trim the projected $155 billion budget deficit while keeping his campaign promise of no new taxes, Wall Street markets and the value of the dollar against foreign currencies have declined since Bush was elected Nov. 8. Bush has said he wants a "flexible freeze" on the federal budget, allowing spending to increase only at the rate of inflation. The deficit will decline, Bush contends, as the economy continues to grow and federal tax receipts from that growth increase.