It’s really all about the loft progression and the length(s) of the clubs when you’re trying to manage the distance progressions you would need. As a beginner it’s as important to simply have clubs in your bag you are comfortable with and feel you have the best chance with to hit good shots.
You can’t look at the numbers o the club and directly compare. That is, a 4 hybrid will not always be the replacement for a #4 iron. they may be similar lofts, but are usually played at different club lengths. My guess is that, at some point, you will need something between the #4 hybrid and the #6 iron. Without knowing the loft of your irons, I can’t give you exactly what might work, but we can make some assumptions. if your #6 iron is 29 or 30 degrees, for example, and you have a #4 hybrid that is 23 degrees, a #5 hybrid at 26 would make sense to help you fill that distance gap. Again, because the hybrids a usually a little longer in length and generally are lighter in overall weight you will probably hit the farther than a corresponding iron, but you’ll just have to assess that once you get your set up.
As far as replacing a #3 wood with a #3 hybrid, usually #3 wood will have less loft and be longer in playing length, so it will go farther and be harder to hit. Shorter the club and the higher the loft the easier a club is to hit, generally speaking. So yo could get a #3 hybrid, drop the #3 wood, but I would not expect to hit the #3 hybrid as long as the #3 wood (when you hit it good). You should be more consistent with the #3 hybrid because it is shorter i playing length and has a little more loft.
The main thing as a beginner is to have clubs that you are comfortable with and that are not too long, too low lofted or too heavy. So focus on getting the clubs that you feel the most comfortable with and go to work, practicing when you can and seeing some success with those clubs. Don’t get too caught up in having all the distance gaps covered and having a complete traditional set. That will become more important as you get more consistent in your ball striking.
Britt Lindsey