Do not disassemble the lifters. The only way to bleed off lifters that are full of oil is to install them in the engine and set the pre-load at zero.
After all the lifters are set at zero pre-load, turn the engine a few revolutions by hand to force out the excess oil. Do not crank the engine with the starter or you risk engine damage with open valves. After the lifters are bled off, you can set the lifters at the correct pre-load. Only spring in the lifters is holding pressure against the push rod seat and the lifters do not have a hydraulic lock.