Following are the various steps of preparing herbarium:
(a) Collection: This step involves collection of a particular species.
(b) Pressing: This step involves spreading the specimen and pressing it between two sheets of paper so as to preserve most of the parts.
(c) Drying: This step usually involves drying under the sun. 
(d) Poisoning: Sometimes, antifungal treatment needs to be given to the specimen to preserve it for longer duration.
(e) Mounting: This step involves mounting the specimen over a herbarium sheet.
(f) Labelling: This step involves writing full information and classification of the specimen.

Different tools which need to be carried while collecting plants for the preparation
of a herbarium are; digger and pruning knife, sickle, vasculum, polythene bags, old
newspaper or magazine, blotting paper, plant press, field notebooks, herbarium
sheets, glue, labels, etc.

The preserved material should have thorough information and classification. This should
include the names of division, order, family, genus and species.