Definitely get an Uplula if you're having problems loading your magazines. And get one even if you're not having problems. Loading is so much quicker and easier.
However, if you think loading your Shield .45 magazines is difficult, wait until you try to reassemble your 7-rounders after cleaning. You'll get so frustrated, you'll forget about your loading problems entirely!
Fortunately, some grizzled veterans of Shield .45 ownership have devised solutions to this dilemma, which you can find here:
Shield .45 7-round magazine reassembly tip
Just another benefit of membership in the Smith & Wesson Forum!