You obviously have many choices.
According to Suntour this is your chainset's
spec.
If you are going to do the switch yourself, I would suggest you check to ensure yours is square tapered - you should be able to see 4 flat surfaces where the bottom bracket spindle meets the crank arms. It is good to check because quite a few manufacturers sell the same crankset model with different attachment configurations.
If it is indeed square tapered, and assuming your bottom bracket is ok and not needing to be replaced, a direct replacement should be a crankset that requires a 113mm JIS spindle to deliver the
chainline of your current chainset (e.g. a Shimano Deore
M442 chainset for square taper will deliver a 50mm chainline with a 113mm UN26). Either way it is important to ensure the current chainline is maintained, otherwise the switch can have knock-on effects on the performance of the front mech.
You could of course just get the
same chainset if you have been happy with it.
Tool-wise, it depends on how the chainset is fixed to the bottom bracket. Park has a
good guide. Similarly for
pedals.
If you don't have much tools and if a crank puller is required, something like
this toolkit could save you a lot of money in the long run.