It can be much harder, it comes down to the amount of total investment. A tank set up with good quality equipment will be much easier from day one to maintain than one set up quickly on a shoestring budget. If things are not done right from the start you can expect to put out a lot of initial money fixing multiple problems.
"How do you make saltwater for water changes?"
You use a commercial grade aquarium salt mix. Mix to the proper level for your particular tank. In a separate bucket mix together your sea salt and water, use a small power head to help mix the salt up.