If you have not been using a modeling program before, it takes time in any to become proficent... Just knowing what commands do what takes awhile, and to begin thinking in modeling terms of breaking down an object to component parts... that comes faster to some then others. Recommend finding one that makes sense to you, as far as layout and workflow, spend time playing and doing tuts, to get a hang of it... AND have no doubt eventually you will find limitations with any you choose and note that another program has that additional extra in certain areas you want. Once you get the hang of one, the next becomes easier. Demos will help get you started in choosing. Hitting the forums here and at other sites, might give an additional understanding of what other users like and dislike about one, as well as what level of peer support you can obtain. If you have the money. The biggies like Maya, Lightwave, and Max do more then just model... Texturing, animation, etc... Just some thoughts.