I wanna swap out the speaker on my DSL401

The G12M Greenback has evolved over the decades but still retains its essential, sought-after tone.

This version exhibits all the classic G12M characteristics but is voiced with additional broad mid-range attack and restrained top-end to give a forward, punchy attitude to chords and a searing lead tone without fizz.
With its well-controlled low-end it can be used singly in low-powered amps, or in multiples for high-power rock heads. It’s an ideal speaker to bring drive and definition to modern high gain amps.

General specifications
Nominal diameter 12", 305mm
Power Rating 25W
Nominal impedance 8Ω
Sensitivity 98dB
Chassis type Pressed steel
Voice coil diameter 1.75", 44.5mm
Voice coil material Round copper
Magnet type Ceramic
Magnet weight 35oz, 0.99kg
Frequency range 75-5000Hz
Resonance frequency, Fs 75Hz
DC resistance, Re 6.7Ω

Mounting Information
Diameter 12.2", 309mm
Overall depth 5.1", 130mm
Magnet structure diameter 5.9", 150mm
Cut-out diameter 11.1", 283mm
Mounting slot dimensions 0.31", 7.9mm Ø
Number of mounting slots 4
Mounting slot PCD 11.7", 297mm
Unit weight 7.9lb, 3.6kg

I can buy this for $200 Au

Will this speaker be alot better than the stock speaker which from all reviews is pretty bellow average.

DO I have the neccersary skills to make the switch with a screwdriver?

Is there any better speaker I should consider? Alot of high gain solo work mostly done through this.
The DSL is 40 watts and the Greenback only has a 25 watt power rating. You want the speaker to have a higher power rating than the amp.