you can snip out older leaves on microsorum just snip off with snarp scissors close to the rhizome, will grow back, how fast depends on your tank.
moss just cut like a haircut, bear in mind it sinks rather than floats so enure all filters are off and if possible have a syphon going to suck it up as you trim or it will be everywhere in your tank... especially if you have a carpet.
Val leaves can be held and pushed back towards the substrate to remove a whole leaf or you can cut with scissors but you will always have an ugly cut end.
Really you need to find the cause of the hair algae though as it will always come back, particlarly in moss and quicker than the moss grows.