Nicehash only rents a minimum of 50 TH/s, I'm just hobby mining so at that rate I might as well just buy my own antminer.
this is not true, you can rent just about any hash power you want. however the minimum amount of btc is 0.005 btc , then using whatever amount you want you can declare the amount of hashing power you want, the more you ask for the less time you'l get it
for example at the time of typing this, the price per PH per Day for sha256 is 0.0447 btc
so assuming you want 2ph for the same price, then you will have that power for only half a day (12 hours )
say you want to mine for 2 days for that same amount of money then you will request 0.5 PH.
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also notice that many pools give you a specific port to mine when using a rented hashpower, make sure you use the port.
before you start hashing, there is something like a pool-check on NH , you just need to enter your worked, port, statrum and it will till you if NH is compatible to mine on the pool with the specific inputs you gave it. whenever thing is settled, hash away.
notice there is also standard and fixed renting, read about them, pick the one that suits you. if you have any question ask away.