A very watchful eye is needed the first day the enclosure is set up. I suggest that the enclosure is finally tuned and prepared before the tarantula makes its entrance. The enclosure also requires the correct items in it that the tarantula can utilize. Make sure that all objects that are being placed within the enclosure are insecticide free and clean. Nothing that can be easily moved should be placed within the enclosure because it could fall and crush the tarantula.
Substrate plays a very important role it helps create humidity.
The substrate should be at least 6 to 8 centimeters deep for most species. The substrate can be potting soil, pure peat, or even fish tank gravel. A daily misting with water will help elevate humidity but never spray the tarantula. Live plants can be used but require their own special maintenance. Make sure the plant you use can live within the temperature range of the enclosure and also a UV light will be required for the plant's growth.