HI! FIRST, IF YOU LIVE IN A WINDY,DUSTY AREA, AND GET SPIDERS IN YOUR HOME, I WOULDN'T RECOMEND IT AT ALL. WE HAD THE SAME PROBLEMS. BUGS REALLY GET STUCK IN THE TEXTURE WHEN HIT WITH FLY-SWATTERS, AND THE DUST REALLY GETS INTO ALL THE LITTLE KNOOKS AND CRANNIES. BUT IF YOU REALLY WANT TO DO IT- JUST USE DRY JOINT COMPOUND AND ADD WATER TO THAT. MIX QUITE THIN, LIKE PAINT. PUT ON WITH PAINT ROLLER. LET IT DRY PARTIALLY. KNOCK THE TIPS OFF WITH THE SPREADER YOU USE FOR STUCCO. WE USED A PORTABLE PAINT SPRAYER AND DID THE WHOLE HOUSE. BEWARE OF SPIDERS & DUST!!!
I would really recommend the hopper gun. Its really difficult to get good results from rolling on a texture. Plus you can texture a room in like 5 to 10 minutes with a hopper gun. I did both and really disliked the rolled affect. You could buy a sheet of drywall to practice on first either way though.