Few things to keep in mind:
-Win98 will force you to use FAT32. Install it on a different partition. You won't be able to access any files from NTFS partitions.
-If you have more than 512M of RAM you may run into "There is not enough memory available" errors. That is a Windows bug that wasn't relevant 15 years ago.
-You may not find drivers for Win98. That is expected. Nobody wastes time to write drivers for an OS that has been long obsoleted.

That being said I'd honestly skip it. Use a virtual machine such as Oracle VirtualBox or Windows Virtual PC and set an isolated OS there. When it crashes it won't corrupt your entire drive...