No problem at all. Just remember that both sides undo towards the rear of the bike, and a preliminary squirt of penetrating fluid may be beneficial before attempting to remove the current pedals, WD40 is perfect for this.
A proper pedal
SPANNER definitely helps, or if they only have a hex key fitting then a combination
SPANNER will be needed. Or if you have allen wrenches they will also work with the latter, but
T-BAR ones work best as they offer more leverage than traditional allen keys and combination tools
THIS will walk you through the process if you're at all unsure
Don't forget to add a smear of anti-seize grease to the pedal threads before you re-fit them, and each time you remove and re-fit,
COPPER GREASE is perfect for this