.45 is not so hard to handle
similar to you, I'm not the biggest guy and shooting .45 is not a problem and i don't have big hands and large pipes....
I first starting shoot'n i rented various guns at my club, mostly the CZ 9mm .... and really like it, then rented and shot 1911 .45 and (i was still new at this time) and didn't feel comfortable with this larger felt recoil and wasn't impressed....so back to renting and shoot'n cz ... i became very comfortable shoot'n period (overall experience) and was sooo sure i'm now buying a cz... it is a nice gun ! well, then i rented the 1911 again just to try it and have some fun...just before i was going to head to the front counter and order my beloved CZ ....

well, i shot the 1911 very accurate (more so then cz) and it didn't feel like a bad boy gun anymore

i shot very well with it and it felt just right......so, i ran to the counter and bought a Colt 1911 .45 (plain parkerized finish) that was in the display.... Before my last casing hit the Ground
And never looked back .... i've shot it in ipsc since 1995 and have modified it many times thru-out the years and with lightening the loads down to 175 - 180 power factor, it doesn't really have much of kick, recoil is kinda slower and very managable and playing with springs and grips, etc... you can make it a very sweet gun to shoot...but it is more expesive to reload than .40 or 9mm.... so if cost is realy a factor, that's something to consider...
So, yes Man Up

and after a few thousand rounds you'll likely get very comfortable shootin ....
Seriously, the gun has to feel right and if so, you'll shoot it well
i find the .40 has snappier recoil than the .45...
I've never owned or remember shoot'n 1911 in 9mm, so no advise... i'm sure if quality brand name, it'll be fine.
and you can shoot it for cheaper in production, and always change equipment when and if you want to move up to .45 later
if costs are a serious issue...you find the balance of whats right for you.... any caliber you choose, you'll get use to and better with it and practice and practice, which costs $$
I never did get a CZ which i regret, its a nice gun to have in my collection...hopefully one day...
you can buy belt and pouches that can be modified to hold single stack or d.stack mags and stuff, so if ever upgraded, the gear stays the same and only need to change gun and dies....
There are so many avenues to go or change or upgrade in IPSC (if you go this way, I recommend u do), but don't worry about them now, if you want to just get in it fo rnow, go production andget going for now and you'll learn more and find your way and choose your path when you want.
I suggest buying a quality known name brand.
Have fun....
