When the Federal Reserve made its first tentative step toward ending its era of extraordinary monetary intervention, it earned a nickname: the taper tantrum. Global financial markets metaphorically bawled like a toddler on news that the Fed planned on “tapering” its stimulus program. That was nearly four years ago. Ever since, the Fed has moved to decrease access to easy money with the caution of a technician defusing a powerful bomb. After raising its interest-rate target above near-zero levels in December 2015, the Fed waited a full year before doing so again, the slowest pace of rate increases in the modern history of the central bank.
As far as I searched, easy money means a condition in which banks and lenders can loan money easier and borrowers can acquire money more easily from lenders. Then 'decrease access to easy money' means to make it difficult to acquire money? and I don't understand the meaning of 'technician defusing a powerful bomb'.