Nope, most homebrewers start this way. You'll get less hop utilization, but kits take this into account. Make sure both waters are chlorine / chloramine free, and you're all good.
If you have a patio, you can get turkey fryers really cheap this time of year, very common for homebrewers. And if you buy a bag, you can go to Partial Mash or Brew in a Bag all grain brewing really cheap.