Dont pump the up or cause the lifters to be filled with oil prior to installation. This will provide a benefit in the most critical window of time (initial startup - break in) where the maximum spring pressure will not be seen by the lobe/lifter interface because the the collapsed lifter is only partialy compressing the valve spring untill the running engine gradually pumps up the lifters. But more importantly, there is a good chance you will be holding valves open and wont be able to start quickly or worse (piston valve contact, coil bind).