Rigging in Poser and Blender are approached differently so anything rigged in Poser has to be re-rigged for use in Blender and vice versa. You can outside rigging into Blender with the FBX and Collada file formats but you have to bind the mesh to the skeleton and adjust all your deformations to work in Blender, slightly easier than building a rig completely from scratch but still a chore.

When creating new Poser objects it is MUCH easier to create your grouping in Blender then export to Poser for rigging rather than using the group tool in Poser.

Naming conventions have to be closely adhered to when naming object groups, Blender adds data blocks automatically and appends the block name to the naming. You just have to be sure of the naming of groups prior to exporting to Poser. You can rename object groups using a text editor inside the .obj file but it's just easier to handle everything up front.

Poser's tiny scale is a problem anywhere you try to work outside of Poser. I make it a habit to scale up anything Poser related by a factor of 4 or 5 after import, do the work, return the object to Poser scale, then export.

If you decide to try Blender I have a tutorial that is specifically for creating clothing items for use in DAZ Studio and Poser. The tutorial covers modeling a simple t-shirt  as a way of introducing the tools and preparing the item for export to Poser. It does require you to be somewhat familiar with finding your way around the Blender interface though I do try to define key combos used.

Blender can be tough to learn but so is any other high end modeling suite, fortunately there is a strong community of Blender user's that can provide assistance.