Buy a new keyboard, send it out to someone with experience... Or...
Learn on something else first
Learning to solder, and de-solder (which I find much more difficult, especially now that we use non-leaded solder) isn't really something you want to learn on an expensive mechanical keyboard, you WILL screw it up, how bad and is it fixable is the real question (melted switch, burnt off pad). I recommend learning on old motherboards since the capacitors are often similar to desoldering a switch or non-s.m.d. LED. If you don't have any, ask a local computer shop, odds are they have one laying around.
As mentioned, Cherry springs are rated differently than aftermarket, Cherry uses trigger pressure (which is about 5-10grams extra to trigger a tactile switch), aftermarket measure how much it takes to fully compress the spring. Note that I did not say bottom out the switch.
A 62g aftermarket spring is actually almost identical to a light Cherry spring (red/blue) at the actuation point (less than a 2gram difference), the difference is that it has more coils and is longer, unlike a Cherry where the spring slowly ramps up in pressure, the 62gram starts off lighter than Cherry, matches it at actuation point and the ramps up to become quite a bit stiffer before the switch bottoms out.
If you want stiffer you will need the 67g aftermarket springs, which will change the ramp up, but also be stiffer at the actuation point. If you want similar to a Cherry spring, but just something in between Red and Black, look into finding Outemu light springs (red or blue) which are right in between Cherry red and black.